explicit non-specific-tag

Hi--

Section 6.28 in spec has:

    # Assuming conventional resolution:
    - "12"
    - 12
    - ! 12

Two questions.

1) What is this last seq element, the "explicit non-specific-tag",
supposed to resolve to?

The spec says: !<tag:yaml.org,2002:str> "12", but when I run this
through Ruby's Psych lib, which uses libyaml, it is coming back as
an !!int:

    > YAML.load('- ! 12')
    => [12]

I think that might be right and spec wrong. But then:

    > YAML.load('- ! "12"')
    => [12]

Is that right?

2) When MUST an explicit non-specific-tag be used?

I ask b/c I noticed libyaml is putting such a tag on every !!str node
that has characters that need to be escaped. As it seems to be
completely unnecessary, and make the output less human-readable, I do
not understand why it is being done.


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