Any is excessively used as outer context for inference

Consider this example:

from typing import Any
  
def foo(**kwargs: Any) -> None: ...

foo(bar=reveal_type([1])) # Revealed type is List[Any]

Such behavior causes many false negatives for plugins that provide precise type checking for various ORMs, this includes SQLAlchemy plugin, our internal plugins, and likely Django plugin.

My guess this was added so that an empty list in Any context is inferred as List[Any] instead of List[<nothing>], but I think this is counterproductive. If empty collections cause issues for plugins they can easily work around using private APIs to re-infer argument type in generated precise context (for example using has_uninhabited_component() and ctx.api.accept()). Or maybe we can provide public API for inference.

Riproduci l’esempio con mypy e verifica in che modo il contesto esterno Any influisce su reveal_type([1]) in una chiamata con **kwargs: Any. Esamina le API di reinferenza del plugin menzionate nell’issue, tra cui has_uninhabited_component() e ctx.api.accept(). Il lavoro è completato quando viene concordato e implementato un comportamento di inferenza coerente o un’API pubblica, con copertura di regressione per l’esempio e gli scenari del plugin interessati.