restore `[ParseAlleleCount]` functionality #2764

Job	Run time
Non publication, Zenodo skip	1s
Production release, Zenodo publication	0s
Generate wheels matrix	7s
Build source distribution	28s
Build wheels on cp313-manylinux_x86_64	3m 49s
Build wheels on cp313-win_amd64	6m 8s
Build wheels on cp313-win_arm64	2m 47s
Build wheels on cp313-macosx_x86_64	4m 31s
Build wheels on cp313-macosx_arm64	2m 20s
Upload to Test_PyPI	0s
Upload binary wheels and sdist to GH release page	0s
Upload to PyPI	0s
	20m 11s

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