Help understanfing tag resolution confusion

HI, I've been work with the Pysch library which is the YAML library that 
Ruby uses built upon libyaml.

Psych provides a away to add domain tag. Below I add a tag with `foo.org` 
domain and `foo` name,
it creates a tag from that called `tag:foo.org:foo`. It also creates a tag 
called `tag:foo`.
(See https://github.com/tenderlove/psych/blob/master/lib/psych.rb#L304-L308)

    require 'yaml'

    YAML.add_domain_type('foo.org', 'foo'){ |*a| "frak" }
    ["tag:foo.org:foo", #<Proc:0x00000000eec280@(irb):2>]

But then I can use all the following tags in the YAML to reolve to this 
domain tag:

    YAML.load('--- !<tag:foo.org:foo> "a"')
    => "frak"

    YAML.load('--- !<tag:foo> "a"')
    => "frak"

    YAML.load('--- !tag:foo.org:foo "a"')
    => "frak"

    YAML.load('--- !tag:foo "a"')
    => "frak"

    YAML.load('--- !foo.org:foo "a"')
    => "frak"

    YAML.load('--- !foo "a"')
    => "frak"

Are all of these tags actually valid and resolvable to `tag:foo.org:foo` of 
`tag:foo` ?
It seems like the `tag:` is meaningless and can match if it is there or if 
it is not there.
Is that right? Or is this non-spec behaviour on Psych's part?

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