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qapi/expr.py: Modify check_keys to accept any Collection
This is a minor adjustment that lets parameters @required and @optional take tuple arguments, in particular (). Later patches will make use of that. (Iterable would also have worked, but Iterable also includes things like generator expressions which are consumed upon iteration, which would require a rewrite to make sure that each input was only traversed once. Collection implies the "can re-iterate" property.) Signed-off-by: John Snow <jsnow@redhat.com> Message-Id: <20210421182032.3521476-10-jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
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