Using the type alias created by `TypeAliasType` which is the base of a type statement, mypy gives error

[hyperkai]

Memo:

• mypy test.py
• mypy 1.19.1
• Python 3.14.0

Using the type alias created by a type statement, mypy gives no error as shown below:

type TA[T] = T

v: TA[int] = 100 # No error

But using the type alias created by TypeAliasType which is the base of a type statement, mypy gives the error as shown below:

*Memo:
pyright, pyrefly and ty work for TypeAliasType.

from typing import TypeVar, TypeAliasType

T = TypeVar('T')

TA = TypeAliasType('TA', value=T, type_params=(T,))

v: TA[int] = 100 # Error

error: Variable "test.TA" is not valid as a type

Basically, a base class works like the old syntax of generics TypeVar, TypeVarTuple and ParamSpec but the type alias created by TypeAliasType doesn't work.