fix: dont try to convert attrSets that are not paths.

[vic]

No description provided.

[Copilot]

Pull Request Overview

This PR refines the file traversal pipeline to avoid converting non-path attribute sets to strings by introducing explicit path-like checks, updating the filter composition, and adding a test for non-path inputs.

• Add isPathLike and isDirectory predicates to distinguish real filesystem paths from other Nix attrsets.
• Refactor filter to only stringify values when they are actual paths or outPaths.
• Introduce a new test in checkmate.nix to verify non-path values pass through unchanged.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
default.nix	Define isPathLike/isDirectory, replace inline path checks and the previous filter logic.
checkmate.nix	Add a test case to ensure non-path values aren’t stringified by the import-tree pipeline.

Comments suppressed due to low confidence (2)

default.nix:44

• [nitpick] The local name filter shadows the built-in and can be confusing; consider renaming it to something more descriptive like combinedFilter or pathAwareFilter.

          filter = x: if isPathLike x then pathFilter x else filterf x;

checkmate.nix:206

• It would be helpful to add a complementary test for directory paths (via isDirectory) to ensure that the new directory branch in default.nix is exercised.

        import-tree."test passes non-paths without string conversion" = {