Dolph Mathews 10c5961426 Make __all__ immutable
Using a mutable type implies that it's acceptable for the set of
publicly-accessible attributes to be mutated at runtime, which defeats
their intended purpose of documenting the public interface. Tuples are
immutable.

Change-Id: Ib3ab93224ba240040b08ece481ef5ba620c3f658
2015-10-01 18:21:31 +00:00
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