[New-bugs-announce] [issue46743] Enable usage of object.__orig_class__ in __init__

[Gobot1234]

New submission from Gobot1234 <gobot1234yt at gmail.com>:

When using `__call__` on a `typing/types.GenericAlias` `__orig_class__` is set to the `GenericAlias` instance, however currently the mechanism for this does not allow the `__origin__` to access the `GenericAlias` from `__origin__.__init__` as it performs something akin to:
```py
def __call__(self, *args, **kwargs):
    object = self.__origin__(*args, **kwargs)
    object.__orig_class__ = self
    return object
```
I'd like to propose changing this to something like:
```py
def __call__(self, *args, **kwargs):
    object = self.__origin__.__new__(*args, **kwargs)
    object.__orig_class__ = self
    object.__init__(*args, **kwargs)
    return object
```
(Ideally `__orig_class__` should also be available in `__new__` but I'm not entirely sure if that's possible)

AFAICT this was possible in the typing version back in 3.6 (https://github.com/python/typing/issues/658 and maybe https://github.com/python/typing/issues/519). Was there a reason this was removed?

----------
components: Library (Lib)
messages: 413198
nosy: Gobot1234, gvanrossum, kj
priority: normal
severity: normal
status: open
title: Enable usage of object.__orig_class__ in __init__
type: enhancement
versions: Python 3.11

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<https://bugs.python.org/issue46743>
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