diff --git a/src/main/java/org/scijava/table/DefaultTableIOPlugin.java b/src/main/java/org/scijava/table/DefaultTableIOPlugin.java
index aceaab3..85bb5ef 100644
--- a/src/main/java/org/scijava/table/DefaultTableIOPlugin.java
+++ b/src/main/java/org/scijava/table/DefaultTableIOPlugin.java
@@ -247,18 +247,14 @@ private GenericTable open(final Location source, TableIOOptions.Values options)
 		return options.parser();
 	}
 
-	static Function<String, Object> guessParser(String content) {
+	static Function<String, ?> guessParser(String content) {
 		try {
-			Integer.valueOf(content);
-			return Integer::valueOf;
-		} catch(NumberFormatException ignored) {}
-		try {
-			Long.valueOf(content);
-			return Long::valueOf;
-		} catch(NumberFormatException ignored) {}
-		try {
-			Double.valueOf(content);
-			return Double::valueOf;
+			Function<String, ?> function = s -> Double.valueOf(s
+					.replace("infinity", "Infinity")
+					.replace("Nan", "NaN")
+			);
+			function.apply(content);
+			return function;
 		} catch(NumberFormatException ignored) {}
 		if(content.equalsIgnoreCase("true")||content.equalsIgnoreCase("false")) {
 			return Boolean::valueOf;
diff --git a/src/test/java/org/scijava/table/DefaultTableIOPluginTest.java b/src/test/java/org/scijava/table/DefaultTableIOPluginTest.java
index cdbc084..6a72835 100644
--- a/src/test/java/org/scijava/table/DefaultTableIOPluginTest.java
+++ b/src/test/java/org/scijava/table/DefaultTableIOPluginTest.java
@@ -111,7 +111,7 @@ public void testDefaultOptions() throws IOException {
 	}
 
 	/**
-	 * Tests if quoting works in different senarios.
+	 * Tests if quoting works in different scenarios.
 	 */
 	@Test
 	public void testQuote() {
@@ -160,7 +160,7 @@ public void testQuote() {
 	}
 
 	/**
-	 * Tests if samll tables could be opened/saved correctly.
+	 * Tests if small tables can be opened/saved correctly.
 	 */
 	@Test
 	public void testSmallTables() {
@@ -250,11 +250,13 @@ public void testGuessParser() {
 		assertEquals(false, DefaultTableIOPlugin.guessParser("false").apply("false"));
 		assertEquals(123.0, DefaultTableIOPlugin.guessParser("123.0").apply("123.0"));
 		assertEquals(-123.0, DefaultTableIOPlugin.guessParser("-123.0").apply("-123.0"));
-		assertEquals(3, DefaultTableIOPlugin.guessParser("3").apply("3"));
-		assertEquals(36564573745634564L, DefaultTableIOPlugin.guessParser("36564573745634564").apply("36564573745634564"));
+		assertEquals(3.0, DefaultTableIOPlugin.guessParser("3").apply("3"));
+		assertEquals(36564573745634564d, DefaultTableIOPlugin.guessParser("36564573745634564").apply("36564573745634564"));
 		assertEquals(1234567890.0987654321, DefaultTableIOPlugin.guessParser("1.2345678900987654E9").apply("1.2345678900987654E9"));
 		assertEquals(Double.NaN, DefaultTableIOPlugin.guessParser("NaN").apply("NaN"));
+		assertEquals(Double.NaN, DefaultTableIOPlugin.guessParser("Nan").apply("Nan"));
 		assertEquals(Double.NEGATIVE_INFINITY, DefaultTableIOPlugin.guessParser("-Infinity").apply("-Infinity"));
+		assertEquals(Double.POSITIVE_INFINITY, DefaultTableIOPlugin.guessParser("infinity").apply("infinity"));
 		assertEquals(0.0, DefaultTableIOPlugin.guessParser("0.0").apply("0.0"));
 	}