Fixes a bug when the source and target run in opposite directions #688

Job	Run time
Build sdist	12s
build macos-latest (arm64) wheels	28s
build ubuntu-latest (x86_64) wheels	3m 41s
build windows-latest (AMD64) wheels	1m 15s
build macos-latest (x86_64) wheels	20s
Publish to PyPI	0s
Show artifacts	0s
Publish to Test PyPI	0s
	5m 56s

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