[ruby-core:47029] [ruby-trunk - Feature #6840][Open] YAML tag method

Issue #6840 has been reported by trans (Thomas Sawyer).

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Feature #6840: YAML tag method
https://bugs.ruby-lang.org/issues/6840

Author: trans (Thomas Sawyer)
Status: Open
Priority: Normal
Assignee: 
Category: lib
Target version: 1.9.3


=begin
When loading YAML documents that have a tag, there doesn't seem to be anyway to query for that information.

  h = YAML.load("--- !foo\na: 1\nb: 2")
  h  #=> {"a"=>1, "b"=>2}
  h.what_method?  #=> "!foo"

I know about `YAML.add_domian_tag` and the like, but registering tags up front doesn't always fit the usecase. For instance, I am working on a project where I don't want the end users to have to use a support library to work with the data, and I certainly don't expect them to copy and paste dozens of lines of #add_domain_tag boilerplate to their projects. Yet the tags can be useful to them for type revison information, e.g.

  --- !foo/2

So this is the second revision of the foo type. The information could be important to consumer apps to ensure they handle the data properly.  

So I am proposing that Pysch add a method (maybe call it `#yaml_tag`), that can be used to get this information from an object when it has been loaded via YAML.
=end



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