Cleaned up some code duplication and python version checks

[brandonschabell]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors Python version compatibility checks and reduces code duplication by introducing centralized utilities. The main focus is on cleaning up repeated version checks throughout the codebase and consolidating common functionality.

• Centralized Python 3.12+ version check in a dedicated compatibility module
• Added reusable cleanup_escapes function to eliminate duplicate escape sequence handling
• Removed numerous inline version checks in favor of the centralized constant

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
urlpath/_compat.py	New compatibility module with centralized Python version check
urlpath/_utils.py	Added cleanup_escapes function and updated all exports
urlpath/_url.py	Replaced sys.version_info checks with IS_PY312_PLUS constant
urlpath/_flavour.py	Updated version check and improved type checking compatibility

[Copilot]

[nitpick] The conditional import logic is complex and could be simplified. Consider using a try/except ImportError pattern which would be more readable and handle the import availability directly.

Suggested change

	if not TYPE_CHECKING and not IS_PY312_PLUS:
	from pathlib import _PosixFlavour
	else:
	try:
	from pathlib import _PosixFlavour
	except ImportError:

[Copilot]

The intermediate variable assignment is unnecessary. The code can be simplified to 'return super().joinpath(*pathsegments) # type: ignore[return-value]'.

Suggested change

	result = super().joinpath(*pathsegments)
	return result # type: ignore[return-value]
	return super().joinpath(*pathsegments) # type: ignore[return-value]