converter type in attrs not correctly passed on to __init__

[pvandyken]

Describe the bug
In pyright 1.1.358, the generated __init__ types for attrs-wrapped classes no longer respect functions or constructors provided to the converter argument of attrs.field. The now-expected type seems to vary depending on the converter, I haven't found an exact pattern. Simple converters like str seem to work fine.

Code or Screenshots

# test.py
from __future__ import annotations

import attrs

@attrs.define
class A:
    a: dict[str, str] = attrs.field(converter=dict)


test = A(a={"foo": "bar"})

$ pyright test.py
.../test.py
  .../test.py:10:12 - error: Argument of type "dict[str, str]" cannot be assigned to parameter "a" of type "Iterable[list[str]] | Iterable[list[bytes]]" in function "__init__"
    Type "dict[str, str]" cannot be assigned to type "Iterable[list[str]] | Iterable[list[bytes]]"
      "dict[str, str]" is incompatible with "Iterable[list[str]]"
        Type parameter "_T_co@Iterable" is covariant, but "str" is not a subtype of "list[str]"
          "str" is incompatible with "list[str]"
      "dict[str, str]" is incompatible with "Iterable[list[bytes]]"
        Type parameter "_T_co@Iterable" is covariant, but "str" is not a subtype of "list[bytes]"
          "str" is incompatible with "list[bytes]" (reportArgumentType)
1 error, 0 warnings, 0 informations 

VS Code extension or command-line
Just the command-line, this version is not yet shipped with pylance.

[erictraut]

I've fixed the regression, but it's important to note that support for "converter" is experimental and is contingent on the acceptance of PEP 712. The steering council recently signaled that they are disinclined to accept this PEP, although they haven't issued their final decision. I've disabled this functionality by default because I don't want pyright users to assume that it will be implemented. It is still available if you specify "enableExperimentalFeatures: true" in your pyright configuration file. This reflects the fact that the functionality is experimental and will be removed in the future if the steering council rejects PEP 712.

[erictraut]

This is addressed in pyright 1.1.364.