JSON::Validator modifies schema object

[soylent]

schema = { type: "object" }.freeze
JSON::Validator.validate(schema, { })
# RuntimeError: can't modify frozen Hash

I think that this is bad behaviour for JSON::Validator.validate, it should not modify the schema param. Any thoughts?

[soylent]

Actually this causes the following error

schema = { type: "object" }
schema.default_proc # => nil

JSON::Validator.validate(schema, { }) # => true
schema.default_proc # => => #<Proc:0x007fe1ca5b5280@/User...>

JSON::Validator.validate(schema, { })
# TypeError: can't dump hash with default proc
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:523:in `dump'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:523:in `block in singleton class'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:548:in `call'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:548:in `serialize'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:605:in `initialize_schema'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:160:in `block in initialize'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:160:in `synchronize'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:160:in `initialize'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:365:in `new'
    from /Users/Soilent/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-schema-2.1.3/lib/json-schema/validator.rb:365:in `validate'

[hoxworth]

Related to #62 - the default_proc is messing things up, because Marshal can't dump a hash with a default_proc. An immediate fix for this would be to install the multi_json gem, until a fix is in place.

[hoxworth]

This should be fixed in 2.1.5. Thanks!