NewType does not subclass correctly

[Lexicality]

Summary

Types created by NewType do not inherit any methods from their parents

To Reproduce

from typing import NewType

Foo = NewType("Foo", dict)

foo: Foo = Foo({})
foo.

Expected Output

Actual Output

More Info

The documentation for NewType states

The static type checker will treat the new type as if it were a subclass of the original type.

which is how Mypy behaves, but the language server treats NewType types as ...well, new types.
I noticed this because TypedDict doesn't work either, and while writing that issue I discovered this.