* mypy: set implicit-optional = true * find and replace '| None = None' -> '= None' in function args old-commit-hash: 80da3aee147867e46f566b63a96f4fe199e0628d
* mypy: set implicit-optional = true * find and replace '| None = None' -> '= None' in function args old-commit-hash: 80da3aee147867e46f566b63a96f4fe199e0628d