JRuby Yaml implementation (psych) fails dumping "-." #1968
Description
I'm not sure whether this belongs here or on the psych project, since I think work is still underway to move the jruby implementation under that umbrella.
Under jruby-1.7.13:
require 'yaml'
YAML.dump('-.')
ArgumentError: invalid value for Float(): "-"
from org/jruby/RubyKernel.java:448:in `Float'
from /Users/scpike/.rvm/rubies/jruby-1.7.13/lib/ruby/shared/psych/scalar_scanner.rb:99:in `tokenize'
from /Users/scpike/.rvm/rubies/jruby-1.7.13/lib/ruby/shared/psych/visitors/yaml_tree.rb:272:in `visit_String'
from /Users/scpike/.rvm/rubies/jruby-1.7.13/lib/ruby/shared/psych/visitors/yaml_tree.rb:128:in `accept'
from /Users/scpike/.rvm/rubies/jruby-1.7.13/lib/ruby/shared/psych/visitors/yaml_tree.rb:92:in `push'
from /Users/scpike/.rvm/rubies/jruby-1.7.13/lib/ruby/shared/psych.rb:244:in `dump'
from (irb):2:in `evaluate'
from org/jruby/RubyKernel.java:1101:in `eval'
from org/jruby/RubyKernel.java:1501:in `loop'
from org/jruby/RubyKernel.java:1264:in `catch'
from org/jruby/RubyKernel.java:1264:in `catch'
from /Users/scpike/.rvm/rubies/jruby-1.7.13/bin/irb:13:in `(root)'
Here's MRI 2.1.0
2.1.0 :001 > require 'yaml'
=> true
2.1.0 :002 > YAML.dump('-.')
=> "--- \"-.\"\n"