BaseSetting Optional[conset(...)] not validated correctly

[zoopp]

Checks

• I added a descriptive title to this issue
• I have searched (google, github) for similar issues and couldn't find anything
• I have read and followed the docs and still think this is a bug

Bug

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.7.3
            pydantic compiled: True
                 install path: /home/mihai/.virtualenvs/pydantic/lib/python3.9/site-packages/pydantic
               python version: 3.9.1 (default, Dec 13 2020, 11:55:53)  [GCC 10.2.0]
                     platform: Linux-5.10.12-3-ck-x86_64-with-glibc2.32
     optional deps. installed: []

from typing import Optional

from pydantic import BaseModel, BaseSettings, IPvAnyNetwork, conset


class InfoModelSet(BaseModel):
    network_segments: Optional[set[IPvAnyNetwork]]


class InfoModelConset(BaseModel):
    network_segments: Optional[conset(IPvAnyNetwork, min_items=1)]


class InfoSettingsSet(BaseSettings):
    network_segments: Optional[set[IPvAnyNetwork]]


class InfoSettingsConset(BaseSettings):
    network_segments: Optional[conset(IPvAnyNetwork, min_items=1)]


print(f"Info model set: {InfoModelSet()}")
print(f"Info model conset: {InfoModelConset()}")
print(f"Info settings set: {InfoSettingsSet()}")
print()
print(f"Info settings conset: {InfoSettingsConset()}")

Results in:

Info model set: network_segments=None
Info model conset: network_segments=None
Info settings set: network_segments=None

Traceback (most recent call last):
  File "/home/mihai/bug.py", line 25, in <module>
    print(f"Info settings conset: {InfoSettingsConset()}")
  File "pydantic/env_settings.py", line 34, in pydantic.env_settings.BaseSettings.__init__
  File "pydantic/main.py", line 362, in pydantic.main.BaseModel.__init__
pydantic.error_wrappers.ValidationError: 1 validation error for InfoSettingsConset
network_segments
  value is not a valid set (type=type_error.set)

I would have expected the sample to pass without raising errors and network_segments of the InfoSettingsConset instance to be None.

[PrettyWood]

Hi @zoopp and thanks for reporting
You're absolutely right! Luckily the fix was trivial