Is your feature request related to a problem? Please describe.
additionalProperties: false and additionalProperties: { type: "boolean" } naturally translate to closed=trure and extra_items=bool respectively. See https://typing.python.org/en/latest/spec/typeddict.html#class-based-syntax

Describe the solution you'd like
Supported without any extra flags

Describe alternatives you've considered
N/A

Additional context
N/A