[ruby/prism] Fix rational when parsing non decimal integer

https://github.com/ruby/prism/commit/75d4331f7f

lib/prism/node_ext.rb

@@ -81,7 +81,7 @@ module Prism
   class RationalNode < Node
     # Returns the value of the node as a Ruby Rational.
     def value
-      Rational(slice.chomp("r"))
+      Rational(numeric.is_a?(IntegerNode) && !numeric.decimal? ? numeric.value : slice.chomp("r"))
     end
   end
 

test/prism/ruby_api_test.rb

@@ -57,6 +57,8 @@ module Prism
       assert_equal 0.5r, parse_expression("0.5r").value
       assert_equal 42ri, parse_expression("42ri").value
       assert_equal 0.5ri, parse_expression("0.5ri").value
+      assert_equal 0xFFr, parse_expression("0xFFr").value
+      assert_equal 0xFFri, parse_expression("0xFFri").value
     end
 
     def test_location_join