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This makes mypy check clean with the proposed --no-implicit-reexports
flag from PR #6562.
Some of the implicit reexports that were depended on were clearly
intended (type_visitor) and so made explicit, while some were clearly
unintended (Optional from mypy.types!) and fixed.
Probably worth landing this whichever way we decide on #6562, but I
think this PR is an argument in favor.