Allow the mixing of rename and default var; fixes #587

[liuzicheng1987]

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[gemini-code-assist]

Summary of Changes

Hello @liuzicheng1987, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a compatibility issue within the rfl library, allowing developers to combine Rename and DefaultVal attributes on struct fields. The core change involves updating the internal type trait mechanism to correctly recognize default values when a field is also subject to renaming. This enhancement improves the flexibility of data modeling and ensures consistent behavior across different field modifiers.

Highlights

• Feature Enhancement: This pull request enables the mixing of rfl::Rename and rfl::DefaultVal for struct members, allowing fields to have both a custom serialized name and a default value.
• Type Trait Update: The is_default_val type trait has been extended with a new template specialization to correctly identify DefaultVal types even when they are nested within a Rename wrapper.
• Test Coverage: A new test case has been added to test_default_val.cpp to validate the proper serialization and deserialization of a field that utilizes both Rename and DefaultVal.

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[gemini-code-assist]

Code Review

This pull request correctly enables the combination of rfl::Rename and rfl::DefaultVal by adding a template specialization for is_default_val. The changes are accompanied by updates to the tests. My review includes a suggestion to enhance the test coverage to fully validate the new functionality during deserialization.