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@@ -855,7 +855,7 @@ module ActiveRecord
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             raw_value = raw_value.to_i
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           else
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            begin
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-              raw_value = Kernel.Float(raw_value.to_s)
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+              raw_value = Kernel.Float(raw_value)
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             rescue ArgumentError, TypeError
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               record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number])
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               next

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@@ -1391,6 +1391,7 @@ class ValidatesNumericalityTest < ActiveRecord::TestCase
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   INTEGERS = [0, 10, -10] + INTEGER_STRINGS
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   BIGDECIMAL = BIGDECIMAL_STRINGS.collect! { |bd| BigDecimal.new(bd) }
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   JUNK = ["not a number", "42 not a number", "0xdeadbeef", "00-1", "--3", "+-3", "+3-1", "-+019.0", "12.12.13.12", "123\nnot a number"]
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+  INFINITY = [1.0/0.0]
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   def setup
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     Topic.instance_variable_set("@validate_callbacks", ActiveSupport::Callbacks::CallbackChain.new)
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@@ -1402,27 +1403,27 @@ class ValidatesNumericalityTest < ActiveRecord::TestCase
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     Topic.validates_numericality_of :approved
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     invalid!(NIL + BLANK + JUNK)
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-    valid!(FLOATS + INTEGERS + BIGDECIMAL)
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+    valid!(FLOATS + INTEGERS + BIGDECIMAL + INFINITY)
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   end
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   def test_validates_numericality_of_with_nil_allowed
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     Topic.validates_numericality_of :approved, :allow_nil => true
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     invalid!(BLANK + JUNK)
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-    valid!(NIL + FLOATS + INTEGERS + BIGDECIMAL)
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+    valid!(NIL + FLOATS + INTEGERS + BIGDECIMAL + INFINITY)
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   end
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   def test_validates_numericality_of_with_integer_only
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     Topic.validates_numericality_of :approved, :only_integer => true
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-    invalid!(NIL + BLANK + JUNK + FLOATS + BIGDECIMAL)
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+    invalid!(NIL + BLANK + JUNK + FLOATS + BIGDECIMAL + INFINITY)
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     valid!(INTEGERS)
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   end
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   def test_validates_numericality_of_with_integer_only_and_nil_allowed
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     Topic.validates_numericality_of :approved, :only_integer => true, :allow_nil => true
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-    invalid!(BLANK + JUNK + FLOATS + BIGDECIMAL)
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+    invalid!(BLANK + JUNK + FLOATS + BIGDECIMAL + INFINITY)
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     valid!(NIL + INTEGERS)
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   end
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@@ -1443,7 +1444,7 @@ class ValidatesNumericalityTest < ActiveRecord::TestCase
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   def test_validates_numericality_with_equal_to
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     Topic.validates_numericality_of :approved, :equal_to => 10
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-    invalid!([-10, 11], 'must be equal to 10')
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+    invalid!([-10, 11] + INFINITY, 'must be equal to 10')
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     valid!([10])
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   end
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