feat: Add data representation support for enum.StrEnum type

[rapsealk]

Hello pyyaml team!

This pull request resolves #722 by adding represent_str() representer to enum.StrEnum type, targeting python>=3.11.

Though this line can be refactored as:

pyyaml/lib/yaml/representer.py

Line 47 in 69c141a

if data_types[0] in self.yaml_representers:

for representer in self.yaml_representers:
    if isinstance(data_types[0], representer):
        ...

Thanks for the review in advance!

Refs

• https://docs.python.org/3/library/enum.html#enum.StrEnum

[rapsealk]

@nitzmahone Hi! Would you mind asking for a review? Thanks in advance!

[janw]

Bump. Would also love to see this merged. 🙏🏻