Do not serialize mappings with custom __repr__ as dict-s

[vmarkovtsev]

Fixes #1296

[vmarkovtsev]

@sl0thentr0py can you please review this 🙏

[sl0thentr0py]

Hey @vmarkovtsev, thx for the contribution!
Sadly this broke some tests, will investigate and get back to you.

[vmarkovtsev]

I have fixed some tests and the style, but the CI does not trigger again.

[vmarkovtsev]

As I see, the only test that's failing is the serialization of QueryDict in Django that has a custom __repr__ definition.
We can have a global list of class exclusions where the Django integration can append QueryDict, WDYT?

[sl0thentr0py]

@vmarkovtsev yes I think we want to preserve older behavior for classes such as QueryDict here. I'm not sure what other things out there in the wild this will affect. Not sure what I think of another exclusion list tbh.

The other option here is to give you a custom def __sentry_repr__ that if available on any class will automatically short circuit the serializer and use that instead. Would that work for you?

[vmarkovtsev]

Yes, __sentry_repr__ should work. Let's go that path then 👍

[sl0thentr0py]

ok I'll make another PR then

[sl0thentr0py]

closing in favor of #1322