use little endian int

[fft001]

Change Summary

Construct the uuid with a little endian representation of the int.

Related issue number

After a bit of forensic, I saw that uuid-rs does not convert the endianness of the u128.

#772
and @davidhewitt pointed out in this PR
uuid-rs/uuid#406

I tried to use the byte attribute from the python object, so endianness would be handled by python itself. This negated the speed-up I tried to introduce in the first place.

This conversion is a no-op on little endian platforms and should fix the s390x build.

Checklist

• [ X] Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

📢 Thoughts on this report? Let us know!

[codspeed-hq]

CodSpeed Performance Report

Merging #1372 will not alter performance

_{Comparing fft001:fix-uuid-to-string-big-endian (4ab34ad) with main (cd2521e)}

Summary

✅ 155 untouched benchmarks

[sydney-runkle]

Pending happy CI, this looks great! Thanks for the quick fix.

[fft001]

Thanks for helping out!