Use refs in args and Bound in return type where possible

[MarshalX]

notes:

• i didnt found a better way to create PyLong and float as bound than .bind(py)
• we must own object here. triggers +1 counter
• overall calling unbind is better?

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #31 will not alter performance

_{Comparing return-bound (b887d33) with main (8be60ee)}

Summary

✅ 192 untouched benchmarks