fix issue where min/max length validator would raise

lib/typed_params/schema.rb

@@ -66,13 +66,14 @@ def initialize(
           format.key?(:without)
         )
 
-      raise ArgumentError, 'length must be a hash with :minimum, :maximum, :within, :in, or :is keys (but not multiple)' unless
+      raise ArgumentError, 'length must be a hash with :minimum, :maximum, :within, :in, or :is keys (but not multiple except for :minimum and :maximum)' unless
         length.nil? || length.is_a?(Hash) && (
-          length.key?(:minimum) ^
-          length.key?(:maximum) ^
-          length.key?(:within) ^
-          length.key?(:in) ^
-          length.key?(:is)
+          length.key?(:minimum) && length.key?(:maximum) && length.size == 2 ||
+            length.key?(:minimum) ^
+            length.key?(:maximum) ^
+            length.key?(:within) ^
+            length.key?(:in) ^
+            length.key?(:is)
         )
 
       @controller        = controller

spec/typed_params/schema_spec.rb

@@ -151,6 +151,11 @@
     end
   end
 
+  it 'should not raise on multiple :length options' do
+    expect { TypedParams::Schema.new(type: :string, length: { minimum: 1, maximum: 42 }) }
+      .to_not raise_error
+  end
+
   it 'should raise on multiple :length options' do
     expect { TypedParams::Schema.new(type: :string, length: { in: 1..3, maximum: 42 }) }
       .to raise_error ArgumentError