relax Ord restriction on Deserialize

[ian-p-cooke]

I needed to serialize a HashMap of f64 values and couldn't. I think the Ord bound is unnecessary.

---

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1d7dd9b) 77.08% compared to head (960507d) 75.27%.
Report is 8 commits behind head on main.

❗ Current head 960507d differs from pull request most recent head c454ab1. Consider uploading reports for the commit c454ab1 to get more accurate results

Additional details and impacted files

Files	Coverage Δ
src/serde_impls.rs	83.33% <ø> (+8.33%)	⬆️

... and 5 files with indirect coverage changes

[jonhoo]

I agree, this looks reasonable!

The Miri test failure appears to be unrelated. The format lint check is complaining correctly though — would you mind running your change through cargo fmt and update the PR?

[jonhoo]

I'll land this and format it myself :)

[jonhoo]

Released in 0.5.0 🎉