Brendan McCollam

I think the docs are correct in the sense of demonstrating how we can validate token claims using `jwt.JWTClaimsRegistry` . The [RFC7519](https://www.rfc-editor.org/rfc/rfc7519#section-4.1) time-based claims ('iat', 'nbf' 'exp') are validated automatically...

I'm guessing this is a foreseeable limitation, but being unable to Pickle `MISSING` unfortunately also means you can't use `model_copy(deep=True)` on any models with MISSING fields: ```python from pydantic.experimental.missing_sentinel import...

Even if it turns out that sentinels are non-pickleable, would it be possible for `model_copy(deep=True)` to treat `MISSING` as a special case singleton? (i.e. don't try to copy it) The...

@marianhlavac this [is covered in the docs.](https://docs.pydantic.dev/dev/concepts/experimental/#missing-sentinel) >Static type checking of sentinels is only supported with Pyright [1.1.402](https://github.com/microsoft/pyright/releases/tag/1.1.402) or greater, and the enableExperimentalFeatures type evaluation setting should be enabled. You...

Just chiming in that my team are also interested in this feature. :pray:

I've just noticed that the same limitation seems to affect `Form()`, could this fix be extended to cover form POST as well?

It would be a little less convenient, but you could probably achieve this yourself by wrapping backups in some encrypted archive format, for example [7z](https://www.7-zip.org/7z.html).