Inserting a proxy into a set resolves it because it calls hash.

Description

submit() was resolving RefProxy and RefMutProxy arguments because it adds those proxy types to a set. Inserting into a set calls __hash__ which is forwarded to the target necessitating a resolve.

This was fixed by appending the proxies to a list, and ensuring the callback can appropriately handle lists of reference proxies with duplicates.

I'm not happy about how much time I've lost debugging poor application performance due to this bug.

Fixes N/A

Type of Change

• Breaking Change (fix or enhancement which changes existing semantics of the public interface)
• Enhancement (new features or improvements to existing functionality)
• Bug (fixes for a bug or issue)
• Internal (refactoring, style changes, testing, optimizations)
• Documentation update (changes to documentation or examples)
• Package (dependencies, versions, package metadata)
• Development (CI workflows, pre-commit, linters, templates)
• Security (security related changes)

Testing

Added new unit tests.

Pull Request Checklist

• I have read the Contributing and PR submission guides.

Please confirm the PR meets the following requirements.

• Tags added to PR (e.g., breaking, bug, enhancement, internal, documentation, package, development, security).
• Code changes pass pre-commit (e.g., mypy, ruff, etc.).
• Tests have been added to show the fix is effective or that the new feature works.
• New and existing unit tests pass locally with the changes.
• Docs have been updated and reviewed if relevant.