[Proposal] Add some PEP 484 type checking via pytype #187
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There is no particularly strong reason to do this, but it adds one more static analysis tool.
See https://github.com/google/pytype
Note it is currently not enforced as there is no pytest integration (see google/pytype#422). It is relatively easy to add pytype check to github workflow. But I suppose it may become annoying without client-side integration with test suite (i.e. people will sent PRs after running tests only to discover pytype fails for whatever reason).