YAML 2.0: drop directives

Hi all,
I propose to eliminate directives. They do not give any value.

1) YAML directive serves 2 purposes
 - visually divide YAML documents in a stream. This is useful.
 - specify the YAML version. This is useless. The parser (according to the
specification) ignores this value and parses YAML according to its own
rules (which is logical)
If the YAML directive is dropped users may easily compensate the visual
division with a comment.

2) TAG directive is far too complex and confusing. It is never used.
Changing the meaning of tags can be provided to the parser itself. Of
course it will be applied to all the documents in the stream.
The assumption that TAG directives may be different in the stream is wrong.
Users always expect the same interpretation of !foobar in the same stream.

If YAML 2.0 drops both directives we win simplicity and readability.

Cheers,
Andrey

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