New submission from Arie Bovenberg <a.c.bovenb...@gmail.com>:

As discussed in bpo-46382, dataclasses may want to support the __weakref__ slot.

Currently, automatically slotted dataclasses are not given a __weakref__ slot. 
This makes auto-slotted dataclasses incompatible with weakref.

The attrs library has chosen for the following approeach:
- when slots are generated, a __weakref__ slot is added by default
- this may be optionally disabled with the weakref_slot=False flag

See this discussion on why that approach was taken: 
https://github.com/python-attrs/attrs/pull/420

The question for dataclass is: do we want to follow suit? Or perhaps make 
__weakref__ slot opt-in instead of opt-out?

----------
components: Library (Lib)
messages: 415515
nosy: ariebovenberg, eric.smith
priority: normal
severity: normal
status: open
title: Mechanism to enable __weakref__ slot on dataclass(slots=True)
versions: Python 3.11

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<https://bugs.python.org/issue47059>
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