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Consider more precise annotations for dictoolz *_in methods

Right now annotations are pretty crude

toolz-stubs/toolz-stubs/dicttoolz.pyi

Lines 15 to 17 in 5f7f7dc

def assoc_in(d: M, keys: Iterable[Any], value: Any, factory: MappingFactory = ...) -> M: ...
def update_in(d: M, keys: Iterable[Any], func: Callable, default: Optional[Any] = ..., factory: MappingFactory = ...) -> M: ...
def get_in(keys: Iterable[Any], coll: Mapping, default: Optional[T] = ..., no_default: bool = ...) -> T: ...

It should be possible to get something more precise, for example

def get_in(keys: Tuple[T1, T2, T3], coll: Mapping[T1, Mapping[T2, Mapping[T3, U]]], default: Optional[U] = ..., no_default: bool = ...) -> U: ...

However this:

  • Requires large number of overloaded variants to be useful, hence code generation is required.
  • Requires Tuple or equivalent as keys.
  • Might be too restrictive, by requiring Mapping values.

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