**Fixed**
- **oheaders** from a Response contains `Set-Cookie` entries when it should not.
- Static type checker not accepting **list\[str\]** in values for argument **param**.
- Static type checker not accepting **Iterable\[bytes\]** for **data**.
- Function proxy_bypass_registry for Windows may be fooled by insufficient control on our end.
  Patch taken from idle upstream PR psf#6302
- SSLError message related to the certificate revocation could print `None` instead of `unspecified` for the reason.

**Changed**
- Allow setting `None` in max_size for **SharableLimitedDict** to remove limits.
- Using `RLock` instead of `Lock` in **SharableLimitedDict**, and **InMemoryRevocationStatus** classes.

**Misc**
- Missing assert statements for test test_header_validation.
- Unrelated warnings are now silent in our test suite.
- Unexpected warning now trigger an error in our test suite.
- Removed `tests.compat`.
- Removed `test-readme`, `flake8`, and `publish` from Makefile.

**Added**
- Extra-dist install `http3` to force install HTTP/3 support in your environment if not present.
- Extra-dist install `ocsp` to force install certificate revocation support in your environment if not present.