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Add type hints for attributes on BaseCommand classes.
Review Request #13031 — Created May 10, 2023 and submitted
This ensures that all the attributes on
BaseSubCommandhave type hints on the
attributes. This avoids the problem where type checkers complain when
subclasses define attributes of an "invalid type" due to thinking
default values are literals.
Unit tests pass.
Verified the type checker was happy for all subclasses.