functools.partial breaks templated wrapped function

[crusaderky]

from functools import partial
from typing import TypeVar

T = TypeVar("T")

def f(x: int) -> int: ...
pf = partial(f)
def g(x: T) -> T: ...
pg = partial(g)


reveal_type(f(1))
reveal_type(pf(1))
reveal_type(g(1))
reveal_type(pg(1))

Python 3.8.1, mypy 0.770+dev.be883f6770b24bc467ccb993fd77864248b61979 output:

note: Revealed type is 'builtins.int'
note: Revealed type is 'builtins.int*'
note: Revealed type is 'builtins.int*'
note: Revealed type is 'T`-1'

Expected output: int in all cases

[JukkaL]

This seems like a duplicate of #1317.