Support attrs validators #538
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This adds support for attrs validators. Validators are run after decoding the instance has completed, but before calling `__attrs_post_init__`. Since the builtin attrs validators include the attribute name in the error message, we don't add the field to the error path. This feels *a bit* weird, but is way easier since all of this can be done in pure python. When possible, it'd be better to use msgspec's builtin constraints for handling validation. These will be much more performant, and integrate better with the rest of the system.
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This adds support for attrs validators. Validators are run after decoding the instance has completed, but before calling
__attrs_post_init__. Since the builtin attrs validators include the attribute name in the error message, we don't add the field to the error path. This feels a bit weird, but is way easier since all of this can be done in pure python.When possible, it'd be better to use msgspec's builtin constraints for handling validation. These will be much more performant, and integrate better with the rest of the system.
Fixes #535.