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Optional[List] is clunky; an empty sequence can more elegantly convey "no variants". By downgrading "List" to "Sequence", we can also accept tuples; this is useful for the empty tuple specifically, which we may use as a default parameter because it is immutable. Signed-off-by: John Snow <jsnow@redhat.com> Message-Id: <20210216021809.134886-18-jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Doc string touched up] Reviewed-by: Markus Armbruster <armbru@redhat.com>