Annotate string constants in `synapse.api.constants` with `Final` (#11356)
This change makes mypy complain if the constants are ever reassigned, and, more usefully, makes mypy type them as `Literal`s instead of `str`s, allowing code of the following form to pass mypy: ```py def do_something(membership: Literal["join", "leave"], ...): ... do_something(Membership.JOIN, ...) ```
changelog.d/11356.misc
0 → 100644
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