Incompatible type with generic dataclasses inheritance

[Eugene-1984]

The following MWE:

from typing import Generic, TypeVar
import dataclasses

T = TypeVar('T')

@dataclasses.dataclass()
class A(Generic[T]):
    attr: T

A(attr=0)  # OK!

@dataclasses.dataclass()
class B(A[float]):
    ...

B(attr=float(0))
# Argument "attr" to "B" has incompatible type "float"; expected "T"

fails with "Argument "attr" to "B" has incompatible type "float"; expected "T"" error in mypy. But the B class specifies T to be float, how to fix that error?

[ilevkivskyi]

This is a duplicate of #7520