diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/AnalyzedStringFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/AnalyzedStringFieldTypeDescriptor.java
index 1075d974e5b..8dbef5af038 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/AnalyzedStringFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/AnalyzedStringFieldTypeDescriptor.java
@@ -14,6 +14,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class AnalyzedStringFieldTypeDescriptor extends StandardFieldTypeDescriptor<String> {
 
@@ -62,6 +63,11 @@ protected List<List<String>> createMultiResultingInSingleAfterMedian() {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<String> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<String> createIndexableValues() {
 		return new IndexableValues<String>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigDecimalFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigDecimalFieldTypeDescriptor.java
index 2b3eb45c543..fd16592b751 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigDecimalFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigDecimalFieldTypeDescriptor.java
@@ -19,6 +19,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.util.TckConfiguration;
 
 public class BigDecimalFieldTypeDescriptor extends StandardFieldTypeDescriptor<BigDecimal> {
@@ -66,6 +67,16 @@ protected BigDecimal applyDelta(BigDecimal value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<BigDecimal> metricAggregationsValues() {
+		return new MetricAggregationsValues<BigDecimal>() {
+			@Override
+			protected BigDecimal valueOf(int value) {
+				return BigDecimal.valueOf( value ).setScale( 2, RoundingMode.FLOOR );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<BigDecimal> createIndexableValues() {
 		return new IndexableValues<BigDecimal>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigIntegerFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigIntegerFieldTypeDescriptor.java
index 5a0856c2ed5..baa7f6bbe20 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigIntegerFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BigIntegerFieldTypeDescriptor.java
@@ -14,6 +14,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class BigIntegerFieldTypeDescriptor extends StandardFieldTypeDescriptor<BigInteger> {
 
@@ -60,6 +61,16 @@ protected BigInteger applyDelta(BigInteger value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<BigInteger> metricAggregationsValues() {
+		return new MetricAggregationsValues<BigInteger>() {
+			@Override
+			protected BigInteger valueOf(int value) {
+				return BigInteger.valueOf( value * 100L );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<BigInteger> createIndexableValues() {
 		return new IndexableValues<BigInteger>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BooleanFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BooleanFieldTypeDescriptor.java
index 4b2ff18bbc7..8b3f4af3556 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BooleanFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/BooleanFieldTypeDescriptor.java
@@ -12,6 +12,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class BooleanFieldTypeDescriptor extends StandardFieldTypeDescriptor<Boolean> {
 
@@ -46,6 +47,11 @@ protected List<List<Boolean>> createMultiResultingInSingleAfterMedian() {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Boolean> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<Boolean> createIndexableValues() {
 		return new IndexableValues<Boolean>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ByteFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ByteFieldTypeDescriptor.java
index 9f0e7291d1e..7af9016c304 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ByteFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ByteFieldTypeDescriptor.java
@@ -8,9 +8,11 @@
 import java.util.List;
 import java.util.Optional;
 
+import org.hibernate.search.engine.cfg.spi.ConvertUtils;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class ByteFieldTypeDescriptor extends StandardFieldTypeDescriptor<Byte> {
 
@@ -56,6 +58,16 @@ private byte toByteExact(int value) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Byte> metricAggregationsValues() {
+		return new MetricAggregationsValues<Byte>() {
+			@Override
+			protected Byte valueOf(int value) {
+				return ConvertUtils.convertByte( value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Byte> createIndexableValues() {
 		return new IndexableValues<Byte>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/DoubleFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/DoubleFieldTypeDescriptor.java
index 54c62272639..fe1ed1fa3d0 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/DoubleFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/DoubleFieldTypeDescriptor.java
@@ -8,9 +8,11 @@
 import java.util.List;
 import java.util.Optional;
 
+import org.hibernate.search.engine.cfg.spi.ConvertUtils;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class DoubleFieldTypeDescriptor extends StandardFieldTypeDescriptor<Double> {
 
@@ -49,6 +51,16 @@ protected Double applyDelta(Double value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Double> metricAggregationsValues() {
+		return new MetricAggregationsValues<Double>() {
+			@Override
+			protected Double valueOf(int value) {
+				return ConvertUtils.convertDouble( value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Double> createIndexableValues() {
 		return new IndexableValues<Double>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FieldTypeDescriptor.java
index 15d7026ad78..801b1b08221 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FieldTypeDescriptor.java
@@ -15,6 +15,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.util.TckConfiguration;
 
 public abstract class FieldTypeDescriptor<F, S extends SearchableProjectableIndexFieldTypeOptionsStep<?, F>> {
@@ -181,6 +182,8 @@ public final AscendingUniqueTermValues<F> getAscendingUniqueTermValues() {
 
 	protected abstract AscendingUniqueTermValues<F> createAscendingUniqueTermValues();
 
+	public abstract MetricAggregationsValues<F> metricAggregationsValues();
+
 	/**
 	 * @return A set of indexables values, not necessarily unique.
 	 */
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FloatFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FloatFieldTypeDescriptor.java
index 0a2e2498908..ac00a6ee8b1 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FloatFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/FloatFieldTypeDescriptor.java
@@ -8,9 +8,11 @@
 import java.util.List;
 import java.util.Optional;
 
+import org.hibernate.search.engine.cfg.spi.ConvertUtils;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class FloatFieldTypeDescriptor extends StandardFieldTypeDescriptor<Float> {
 
@@ -49,6 +51,16 @@ protected Float applyDelta(Float value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Float> metricAggregationsValues() {
+		return new MetricAggregationsValues<Float>() {
+			@Override
+			protected Float valueOf(int value) {
+				return ConvertUtils.convertFloat( value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Float> createIndexableValues() {
 		return new IndexableValues<Float>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/GeoPointFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/GeoPointFieldTypeDescriptor.java
index cfa5d533023..c6a1ee40853 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/GeoPointFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/GeoPointFieldTypeDescriptor.java
@@ -12,6 +12,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class GeoPointFieldTypeDescriptor extends StandardFieldTypeDescriptor<GeoPoint> {
 
@@ -26,6 +27,11 @@ protected AscendingUniqueTermValues<GeoPoint> createAscendingUniqueTermValues()
 		return null; // Value lookup is not supported
 	}
 
+	@Override
+	public MetricAggregationsValues<GeoPoint> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<GeoPoint> createIndexableValues() {
 		return new IndexableValues<GeoPoint>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/InstantFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/InstantFieldTypeDescriptor.java
index 1fd7e227b9b..1aa67e59c22 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/InstantFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/InstantFieldTypeDescriptor.java
@@ -18,6 +18,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class InstantFieldTypeDescriptor extends StandardFieldTypeDescriptor<Instant> {
 
@@ -57,6 +58,16 @@ protected Instant applyDelta(Instant value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Instant> metricAggregationsValues() {
+		return new MetricAggregationsValues<Instant>() {
+			@Override
+			protected Instant valueOf(int value) {
+				return Instant.ofEpochSecond( value * 100_000L );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Instant> createIndexableValues() {
 		return new IndexableValues<Instant>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/IntegerFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/IntegerFieldTypeDescriptor.java
index 0ad6d626ce7..f9b8e0c4a8d 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/IntegerFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/IntegerFieldTypeDescriptor.java
@@ -11,6 +11,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class IntegerFieldTypeDescriptor extends StandardFieldTypeDescriptor<Integer> {
 
@@ -49,6 +50,16 @@ protected Integer applyDelta(Integer value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Integer> metricAggregationsValues() {
+		return new MetricAggregationsValues<Integer>() {
+			@Override
+			protected Integer valueOf(int value) {
+				return value;
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Integer> createIndexableValues() {
 		return new IndexableValues<Integer>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/KeywordStringFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/KeywordStringFieldTypeDescriptor.java
index f6d05b0d669..54cf2e3d2ed 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/KeywordStringFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/KeywordStringFieldTypeDescriptor.java
@@ -11,6 +11,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class KeywordStringFieldTypeDescriptor extends StandardFieldTypeDescriptor<String> {
 
@@ -54,6 +55,11 @@ protected List<List<String>> createMultiResultingInSingleAfterMedian() {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<String> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<String> createIndexableValues() {
 		return new IndexableValues<String>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateFieldTypeDescriptor.java
index a9376eb7b5b..ea9ae891e31 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateFieldTypeDescriptor.java
@@ -13,6 +13,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class LocalDateFieldTypeDescriptor extends StandardFieldTypeDescriptor<LocalDate> {
 
@@ -51,6 +52,16 @@ protected LocalDate applyDelta(LocalDate value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<LocalDate> metricAggregationsValues() {
+		return new MetricAggregationsValues<LocalDate>() {
+			@Override
+			protected LocalDate valueOf(int value) {
+				return LocalDate.ofEpochDay( value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<LocalDate> createIndexableValues() {
 		return new IndexableValues<LocalDate>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateTimeFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateTimeFieldTypeDescriptor.java
index 95370a80046..77d329f579a 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateTimeFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalDateTimeFieldTypeDescriptor.java
@@ -5,6 +5,7 @@
 package org.hibernate.search.integrationtest.backend.tck.testsupport.types;
 
 import java.time.LocalDateTime;
+import java.time.ZoneOffset;
 import java.time.temporal.ChronoUnit;
 import java.util.Arrays;
 import java.util.List;
@@ -14,6 +15,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class LocalDateTimeFieldTypeDescriptor extends StandardFieldTypeDescriptor<LocalDateTime> {
 
@@ -53,6 +55,16 @@ protected LocalDateTime applyDelta(LocalDateTime value, int multiplierForDelta)
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<LocalDateTime> metricAggregationsValues() {
+		return new MetricAggregationsValues<LocalDateTime>() {
+			@Override
+			protected LocalDateTime valueOf(int value) {
+				return LocalDateTime.ofEpochSecond( value, 0, ZoneOffset.UTC );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<LocalDateTime> createIndexableValues() {
 		return new IndexableValues<LocalDateTime>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalTimeFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalTimeFieldTypeDescriptor.java
index aa54e643d4e..b9248957e8c 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalTimeFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LocalTimeFieldTypeDescriptor.java
@@ -14,6 +14,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class LocalTimeFieldTypeDescriptor extends StandardFieldTypeDescriptor<LocalTime> {
 
@@ -53,6 +54,11 @@ protected LocalTime applyDelta(LocalTime value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<LocalTime> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<LocalTime> createIndexableValues() {
 		return new IndexableValues<LocalTime>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LongFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LongFieldTypeDescriptor.java
index 4f1e62255af..696ffc9862b 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LongFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/LongFieldTypeDescriptor.java
@@ -10,9 +10,11 @@
 import java.util.List;
 import java.util.Optional;
 
+import org.hibernate.search.engine.cfg.spi.ConvertUtils;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.util.TckConfiguration;
 
 public class LongFieldTypeDescriptor extends StandardFieldTypeDescriptor<Long> {
@@ -61,6 +63,16 @@ protected Long applyDelta(Long value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Long> metricAggregationsValues() {
+		return new MetricAggregationsValues<Long>() {
+			@Override
+			protected Long valueOf(int value) {
+				return ConvertUtils.convertLong( value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Long> createIndexableValues() {
 		return new IndexableValues<Long>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/MonthDayFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/MonthDayFieldTypeDescriptor.java
index f49136005d8..6ed999e6085 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/MonthDayFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/MonthDayFieldTypeDescriptor.java
@@ -17,6 +17,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class MonthDayFieldTypeDescriptor extends StandardFieldTypeDescriptor<MonthDay> {
 
@@ -56,6 +57,11 @@ protected MonthDay applyDelta(MonthDay value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<MonthDay> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<MonthDay> createIndexableValues() {
 		return new IndexableValues<MonthDay>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/NormalizedStringFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/NormalizedStringFieldTypeDescriptor.java
index 70e44dfe078..1c0715fac7a 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/NormalizedStringFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/NormalizedStringFieldTypeDescriptor.java
@@ -15,6 +15,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class NormalizedStringFieldTypeDescriptor extends StandardFieldTypeDescriptor<String> {
 
@@ -68,6 +69,11 @@ protected List<List<String>> createMultiResultingInSingleAfterMedian() {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<String> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<String> createIndexableValues() {
 		return new IndexableValues<String>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetDateTimeFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetDateTimeFieldTypeDescriptor.java
index 6cb6e10133b..81f8c8248c8 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetDateTimeFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetDateTimeFieldTypeDescriptor.java
@@ -19,6 +19,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class OffsetDateTimeFieldTypeDescriptor extends StandardFieldTypeDescriptor<OffsetDateTime> {
 
@@ -64,6 +65,16 @@ protected OffsetDateTime applyDelta(OffsetDateTime value, int multiplierForDelta
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<OffsetDateTime> metricAggregationsValues() {
+		return new MetricAggregationsValues<OffsetDateTime>() {
+			@Override
+			protected OffsetDateTime valueOf(int value) {
+				return OffsetDateTime.ofInstant( Instant.ofEpochSecond( value * 100_000L ), ZoneOffset.UTC );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<OffsetDateTime> createIndexableValues() {
 		return new IndexableValues<OffsetDateTime>() {
@@ -84,7 +95,8 @@ protected List<OffsetDateTime> createSingle() {
 	@Override
 	protected List<OffsetDateTime> createUniquelyMatchableValues() {
 		List<OffsetDateTime> values = new ArrayList<>();
-		for ( LocalDateTime localDateTime : LocalDateTimeFieldTypeDescriptor.INSTANCE.getIndexableValues().getSingle() ) {
+		for ( LocalDateTime localDateTime : LocalDateTimeFieldTypeDescriptor.INSTANCE.getIndexableValues()
+				.getSingle() ) {
 			for ( ZoneOffset offset : createIndexableOffsetList() ) {
 				values.add( localDateTime.atOffset( offset ) );
 			}
@@ -127,7 +139,8 @@ List<ZoneOffset> createIndexableOffsetList() {
 
 	@Override
 	public OffsetDateTime valueFromInteger(int integer) {
-		return LocalDateTimeFieldTypeDescriptor.INSTANCE.valueFromInteger( integer ).atOffset( ZoneOffset.ofHours( 2 ) );
+		return LocalDateTimeFieldTypeDescriptor.INSTANCE.valueFromInteger( integer ).atOffset(
+				ZoneOffset.ofHours( 2 ) );
 	}
 
 	@Override
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetTimeFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetTimeFieldTypeDescriptor.java
index e2b83ab9f90..691be141027 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetTimeFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/OffsetTimeFieldTypeDescriptor.java
@@ -21,6 +21,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class OffsetTimeFieldTypeDescriptor extends StandardFieldTypeDescriptor<OffsetTime> {
 
@@ -65,6 +66,11 @@ protected OffsetTime applyDelta(OffsetTime value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<OffsetTime> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	protected IndexableValues<OffsetTime> createIndexableValues() {
 		return new IndexableValues<OffsetTime>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ShortFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ShortFieldTypeDescriptor.java
index f1125a57200..79b70d52d81 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ShortFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ShortFieldTypeDescriptor.java
@@ -8,9 +8,11 @@
 import java.util.List;
 import java.util.Optional;
 
+import org.hibernate.search.engine.cfg.spi.ConvertUtils;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class ShortFieldTypeDescriptor extends StandardFieldTypeDescriptor<Short> {
 
@@ -56,6 +58,16 @@ private short toShortExact(int value) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Short> metricAggregationsValues() {
+		return new MetricAggregationsValues<Short>() {
+			@Override
+			protected Short valueOf(int value) {
+				return ConvertUtils.convertShort( value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Short> createIndexableValues() {
 		return new IndexableValues<Short>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/VectorFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/VectorFieldTypeDescriptor.java
index fbfed2d5670..fb1240dc2f4 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/VectorFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/VectorFieldTypeDescriptor.java
@@ -10,6 +10,7 @@
 import org.hibernate.search.engine.backend.types.dsl.VectorFieldTypeOptionsStep;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public abstract class VectorFieldTypeDescriptor<F>
 		extends FieldTypeDescriptor<F, VectorFieldTypeOptionsStep<?, F>> {
@@ -41,6 +42,11 @@ protected AscendingUniqueTermValues<F> createAscendingUniqueTermValues() {
 		return null;
 	}
 
+	@Override
+	public MetricAggregationsValues<F> metricAggregationsValues() {
+		return null;
+	}
+
 	@Override
 	public boolean isFieldSortSupported() {
 		return false;
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearFieldTypeDescriptor.java
index 7f659ce7b19..8064cc234ca 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearFieldTypeDescriptor.java
@@ -14,6 +14,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class YearFieldTypeDescriptor extends StandardFieldTypeDescriptor<Year> {
 
@@ -52,6 +53,22 @@ protected Year applyDelta(Year value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<Year> metricAggregationsValues() {
+		return new MetricAggregationsValues<Year>() {
+
+			@Override
+			public Year expectedSum() {
+				return null;
+			}
+
+			@Override
+			protected Year valueOf(int value) {
+				return Year.of( value + 2000 );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<Year> createIndexableValues() {
 		return new IndexableValues<Year>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearMonthFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearMonthFieldTypeDescriptor.java
index 3824af943a2..a13179ac957 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearMonthFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/YearMonthFieldTypeDescriptor.java
@@ -8,6 +8,7 @@
 import java.time.Year;
 import java.time.YearMonth;
 import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoField;
 import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -18,6 +19,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class YearMonthFieldTypeDescriptor extends StandardFieldTypeDescriptor<YearMonth> {
 
@@ -57,6 +59,23 @@ protected YearMonth applyDelta(YearMonth value, int multiplierForDelta) {
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<YearMonth> metricAggregationsValues() {
+		return new MetricAggregationsValues<YearMonth>() {
+
+			@Override
+			public YearMonth expectedSum() {
+				return null;
+			}
+
+			@Override
+			protected YearMonth valueOf(int value) {
+				return YearMonth.of( 2017, Month.NOVEMBER )
+						.with( ChronoField.PROLEPTIC_MONTH, value );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<YearMonth> createIndexableValues() {
 		return new IndexableValues<YearMonth>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ZonedDateTimeFieldTypeDescriptor.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ZonedDateTimeFieldTypeDescriptor.java
index 0be9bd2283f..2c8fddf4796 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ZonedDateTimeFieldTypeDescriptor.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/ZonedDateTimeFieldTypeDescriptor.java
@@ -21,6 +21,7 @@
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.expectations.IndexNullAsMatchPredicateExpectactions;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.AscendingUniqueTermValues;
 import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.IndexableValues;
+import org.hibernate.search.integrationtest.backend.tck.testsupport.types.values.MetricAggregationsValues;
 
 public class ZonedDateTimeFieldTypeDescriptor extends StandardFieldTypeDescriptor<ZonedDateTime> {
 
@@ -72,6 +73,17 @@ protected ZonedDateTime applyDelta(ZonedDateTime value, int multiplierForDelta)
 		};
 	}
 
+	@Override
+	public MetricAggregationsValues<ZonedDateTime> metricAggregationsValues() {
+		return new MetricAggregationsValues<ZonedDateTime>() {
+			@Override
+			protected ZonedDateTime valueOf(int value) {
+				return ZonedDateTime.of( LocalDateTime.ofEpochSecond( value, 0, ZoneOffset.UTC ),
+						ZoneId.of( ZoneOffset.UTC.getId() ) );
+			}
+		};
+	}
+
 	@Override
 	protected IndexableValues<ZonedDateTime> createIndexableValues() {
 		return new IndexableValues<ZonedDateTime>() {
diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/values/MetricAggregationsValues.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/values/MetricAggregationsValues.java
new file mode 100644
index 00000000000..543136d1da5
--- /dev/null
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/testsupport/types/values/MetricAggregationsValues.java
@@ -0,0 +1,34 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.search.integrationtest.backend.tck.testsupport.types.values;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public abstract class MetricAggregationsValues<F> {
+
+	private static final int[] DRIVER_VALUES = new int[] { 9, 18, 3, 18, 7, -10, 3, 0, 7, 0 };
+
+	private final List<F> values = Collections.unmodifiableList( createValues() );
+
+	public final List<F> values() {
+		return values;
+	}
+
+	public F expectedSum() {
+		return valueOf( 55 );
+	}
+
+	protected abstract F valueOf(int value);
+
+	private List<F> createValues() {
+		return Arrays.stream( driverValues() ).mapToObj( this::valueOf ).toList();
+	}
+
+	private int[] driverValues() {
+		return DRIVER_VALUES;
+	}
+}