gh-108455: peg_generator: make the mypy config slightly stricter #108627
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This picks some low-hanging fruit when it comes to the mypy config, enabling various stricter settings that don't require large code changes:
--no-explicit-reexport
truthy-bool
andignore-without-code
error codes--warn-unreachable
can't yet be enabled. (It would take several code changes before we could enable it; it's deferred for now.)mypy
onTools/peg_generator
#108455