YAML 2.0: drop arbitrary nodes to be used as keys

Hi all,
even though it looks like a powerful feature, it gives nothing.

This should be removed:
Note that YAML allows arbitrary nodes
<http://www.yaml.org/spec/1.2/spec.html#node//> to be used as keys
<http://www.yaml.org/spec/1.2/spec.html#key//>. In particular, a key
<http://www.yaml.org/spec/1.2/spec.html#key//> may be a sequence
<http://www.yaml.org/spec/1.2/spec.html#sequence//> or a mapping
<http://www.yaml.org/spec/1.2/spec.html#mapping//>. Thus, without the above
restrictions, practical one-pass parsing
<http://www.yaml.org/spec/1.2/spec.html#parse//> would have been impossible
to implement.

The reason is not that it makes it impossible to convert YAML to JSON.
The reason is that it must never be used. YAML should not advocate
collections (often mutable data structures) as keys.
Of course, the related restrictions, like "1024 rule" or  "key is
restricted to a single line", are also gone.
The key must be a scalar. Point. Whatever it is.

Cheers,
Andrey

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