Use Encoding::BINARY for clarity in lib/json/pure

Author: eregon

lib/json/pure/generator.rb

@@ -74,7 +74,7 @@ def utf8_to_json_ascii(string, script_safe = false) # :nodoc:
     )/nx) { |c|
       c.size == 1 and raise GeneratorError, "invalid utf8 byte: '#{c}'"
       s = c.encode(::Encoding::UTF_16BE, ::Encoding::UTF_8).unpack('H*')[0]
-      s.force_encoding(::Encoding::ASCII_8BIT)
+      s.force_encoding(::Encoding::BINARY)
       s.gsub!(/.{4}/n, '\\\\u\&')
       s.force_encoding(::Encoding::UTF_8)
     }

lib/json/pure/parser.rb

@@ -143,9 +143,9 @@ def convert_encoding(source)
           raise TypeError,
             "#{source.inspect} is not like a string"
         end
-        if source.encoding != ::Encoding::ASCII_8BIT
+        if source.encoding != ::Encoding::BINARY
           source = source.encode(::Encoding::UTF_8)
-          source.force_encoding(::Encoding::ASCII_8BIT)
+          source.force_encoding(::Encoding::BINARY)
         end
         source
       end