Ensures that we can refer to another node from save_to/load_from

[elijahbenizzy]

This fixes a bug in which input types were passed in as "Any", despite the fact that we knew the type from the dataclass. It would result in a mismatch, but now it works (as we use the type we know).

[Short description explaining the high-level reason for the pull request]

Changes

How I tested this

Notes

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[elijahbenizzy]

Posix paths are fine, but I didn't want to change everything to have a union now, so casting is just as easy.