Find a way of avoiding the casts in Shape._from_geojson.

[JamesParrott]

Describe the feature request

Can mypy be taught to narrow to a particular TypedDict from a union of them, based on a test of string keys with Literal values types in them?

https://github.com/GeospatialPython/pyshp/blob/19010dfbe0ef7a7ac0d9c2d1a62585a6a4cd2ec4/src/shapefile.py#L992C9-L992C22

Contributions

• I am interested in implementing the described feature request and submit as a PR.