Give the internal immutable list type .extend and .pop methods (they "should have" been added here when they were added to lists).
Give the internal immutable list type .extend and .pop methods (they
"should have" been added here when they were added to lists).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator