Avoid converting integer as a string into float

activemodel/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Avoid converting integer as a string into float.
+
+    *namusyaka*
+
 *   Remove deprecated behavior that halts callbacks when the return is false.
 
     *Rafael Mendonça França*

activemodel/lib/active_model/validations/numericality.rb

@@ -70,6 +70,7 @@ module ActiveModel
       end
 
       def parse_raw_value_as_a_number(raw_value)
+        return raw_value.to_i if is_integer?(raw_value)
         Kernel.Float(raw_value) if raw_value !~ /\A0[xX]/
       end
 

activemodel/test/cases/validations/numericality_validation_test.rb

@@ -260,6 +260,15 @@ class NumericalityValidationTest < ActiveModel::TestCase
     Person.clear_validators!
   end
 
+  def test_validates_numericality_with_exponent_number
+    base = 10_000_000_000_000_000
+    Topic.validates_numericality_of :approved, less_than_or_equal_to: base
+    topic = Topic.new
+    topic.approved = (base + 1).to_s
+
+    assert topic.invalid?
+  end
+
   def test_validates_numericality_with_invalid_args
     assert_raise(ArgumentError) { Topic.validates_numericality_of :approved, greater_than_or_equal_to: "foo" }
     assert_raise(ArgumentError) { Topic.validates_numericality_of :approved, less_than_or_equal_to: "foo" }