chore(deps): update dependency polyfill to 9.0.3

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Polyfill	nuget	patch	9.0.2 -> 9.0.3

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Release Notes

SimonCropp/Polyfill (Polyfill)

v9.0.3

Compare Source

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR has been generated by Renovate Bot.

[claude]

Claude finished @thomhurst's task —— View job

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PR Review: Polyfill Dependency Update

This PR updates the Polyfill package from version 9.0.2 to 9.0.3.

Todo List:

• Read the changed file to understand the modification
• Review what Polyfill is and its role in the project
• Check the release notes for potential issues
• Assess security implications
• Provide comprehensive review feedback

Review Summary

✅ Code Quality and Best Practices

• Clean dependency management: The change is properly managed through Central Package Management (CPM) in Directory.Packages.props
• Consistent versioning: This is a patch version update (9.0.2 → 9.0.3), which should be low-risk
• Proper configuration: Polyfill is correctly configured with PolyUseEmbeddedAttribute=true to prevent type conflicts

✅ Polyfill Usage Analysis

The Polyfill package serves a critical role in TUnit:

• Cross-platform compatibility: Provides modern .NET APIs for older target frameworks (netstandard2.0, netstandard2.1, .NET Framework)
• Embedded attributes: Used with PolyUseEmbeddedAttribute=true to avoid type conflicts across projects
• Development dependency: Set as PrivateAssets=all meaning it only affects build-time, not runtime distribution
• Conditional usage: Enabled for older frameworks through EnableTUnitPolyfills property

✅ Security Considerations

• Trusted source: Polyfill is maintained by Simon Cropp, a well-known and trusted .NET community member
• Minimal attack surface: This is a build-time polyfill library with no runtime security implications
• Patch release: Version 9.0.3 is a patch release, indicating bug fixes rather than new features

✅ Performance Considerations

• No runtime impact: Polyfills are compile-time transformations
• No breaking changes expected: Patch versions maintain compatibility
• Build-time only: The package is marked as PrivateAssets=all, so no runtime distribution overhead

✅ Test Coverage

• Automated testing: Renovate bot has likely run basic compatibility checks
• CI validation: GitHub Actions will run the full test suite to validate the change
• No test changes needed: Since this is a patch update for a build-time dependency

📋 Release Notes Analysis

The PR shows this is a comparison from 9.0.2 to 9.0.3 with minimal changes. Given the patch version number, this likely contains:

• Bug fixes
• Performance improvements
• Compatibility enhancements
• No breaking changes expected

Recommendation: ✅ APPROVE

This dependency update is low-risk and recommended for the following reasons:

1. Safe update type: Patch version (9.0.3) indicates backward-compatible fixes only
2. Build-time dependency: No runtime impact on TUnit users
3. Trusted maintainer: Simon Cropp has an excellent track record in the .NET ecosystem
4. Proper configuration: TUnit has correctly configured Polyfill to avoid conflicts
5. Automated management: Renovate bot ensures consistent dependency management

The change aligns with TUnit's modern .NET approach and cross-platform compatibility goals. The automerge configuration is appropriate for this type of low-risk dependency update.