gobject new arg count check

[Kevin Ryde <user42 zip com au>]

I wonder if Glib::Object->new could check its arg count to detect
misuse or confusion with the various single-arg class specific "new"s.
I think currently it ignores a "key" without a value.  There's even an
apparent stray type name (in place of a key) in the test suite.

Attachment: GObject.xs.arg-count.diff
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Attachment: 2.t.arg-count.diff
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