Guido van Rossum <gu...@python.org> added the comment: There is very little code that depends on __annotations__ at all, and none of it is very subtle. All actual type checking is done by separate tools (mypy, pytype, PyCharm) that don't import the code and don't care about __annotations__. The __annotations__ variable exists so that other people *may* do useful stuff with it, e.g. design run-time type-checking decorators. So please don't worry about interning.
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