Sort wheel files such that the build number is used only as a tie-breaker

[brettcannon]

pip version

21.0.1

Python version

N/A

OS

N/A

Additional information

No response

Description

Pip currently sorts a wheel's build number higher than the other tags in a wheel.

Expected behavior

The build number should be used to break ties between wheel files when all other details are equal (i.e. name, version, and other tags). See the update to PEP 427 for more details.

How to Reproduce

No response

Output

No response

Code of Conduct

• I agree to follow the PSF Code of Conduct

[uranusjr]

The implementation is easy, just flip the last two components here:

pip/src/pip/_internal/index/package_finder.py

Lines 537 to 540 in bbf8466

	return (
	has_allowed_hash, yank_value, binary_preference, candidate.version,
	build_tag, pri,
	)

(i.e. pri, build_tag instead of build_tag, pri.)

The bulk of the work would be to come up with suitable test cases for this.

[hexagonrecursion]

I am working on a test for this