Psych fails with MBC strings in ASCII-8BIT #2901
Description
Generally, the JRuby version of psych can handle MBC strings. However, if the encoding is ASCII-8BIT, as it would be by default when reading from a socket, JRuby psych is no longer able to parse the YAML.
Simple example:
MRI:
> ruby -v -e 'require "yaml"; p YAML.load("nokogiri: 鋸".force_encoding("ASCII-8BIT"))'
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
{"nokogiri"=>"鋸"}
JRuby:
> bin/jruby -v -e 'require "yaml"; p YAML.load("nokogiri: 鋸".force_encoding("ASCII-8BIT"))'
jruby 9.0.0.0-SNAPSHOT (2.2.2) 2015-04-30 d34f7e9 Java HotSpot(TM) 64-Bit Server VM 25.45-b02 on 1.8.0_45-b14 +jit [linux-amd64]
Psych::SyntaxError: (<unknown>): 'reader' unacceptable character '�' (0x8B) special characters are not allowed
in "'reader'", position 11 at line 0 column 0
parse at org/jruby/ext/psych/PsychParser.java:219
parse_stream at /home/nirvdrum/dev/workspaces/jruby/lib/ruby/stdlib/psych.rb:376
parse at /home/nirvdrum/dev/workspaces/jruby/lib/ruby/stdlib/psych.rb:324
load at /home/nirvdrum/dev/workspaces/jruby/lib/ruby/stdlib/psych.rb:251
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