Improve pydantic model default and alias handling

[cdce8p]

Proposed Changes

Improve default and alias handling.

• Make Optional[...] defaults explicits. This will be required in pydantic v2 anyway.
• Use named argument for Field.default to be better compatible with PEP 681.
• Remove unnecessary Field(...) defaults for required fields.
• Add pydantic.mypy plugin to handle aliases and Config.allow_population_by_field_name = True correctly.
• Update example to use field name if allow_population_by_field_name = True.

Note
The pydantic mypy plugin doesn't work for 1.1.1 just yet. There is an open PR to fix it.

Once the plugin is fixed and pydantic is updated all current mypy errors will be resolved.

Edit

• Update pinned pydantic version to 1.10.6
  https://github.com/pydantic/pydantic/releases/tag/v1.10.6

Related Issues

pydantic/pydantic#5111

[frenck]

Thanks, @cdce8p 👍