Simplify number parsing logic in numericality validation

activemodel/lib/active_model/validations/numericality.rb

@@ -56,16 +56,9 @@ def validate_each(record, attr_name, value)
     protected
 
       def parse_raw_value_as_a_number(raw_value)
-        case raw_value
-        when /\A0[xX]/
-          nil
-        else
-          begin
-            Kernel.Float(raw_value)
-          rescue ArgumentError, TypeError
-            nil
-          end
-        end
+        Kernel.Float(raw_value) if raw_value !~ /\A0[xX]/
+      rescue ArgumentError, TypeError
+        nil
       end
 
       def parse_raw_value_as_an_integer(raw_value)