glyph / automat / 144

100%

Pull #63

travis-ci

Make hashable classes frozen for attrs 17.1.0 (fixes #62).

This version of attrs no longer makes classes hashable by default.
Instead, hashability must be explicitly requested or the class must be
made frozen.

MethodicalInput and MethodicalOutput are both added to a set inside
_core.Automaton, so they both have to be hashable.  Neither are ever
modified, however, so they can be made frozen and thus hashable.

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1072 of 1072 relevant lines covered (100.0%)

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