Properly implement non-zero anchor plates #522

Job	Run time
Test Python 3.8 on ubuntu-latest	3m 18s
Test Python 3.9 on ubuntu-latest	1m 54s
Test Python 3.10 on ubuntu-latest	2m 19s
Test Python 3.11 on ubuntu-latest	2m 48s
Test Python 3.8 on macos-latest	4m 46s
Test Python 3.9 on macos-latest	5m 51s
Test Python 3.10 on macos-latest	4m 40s
Test Python 3.11 on macos-latest	4m 26s
Test Python 3.8 on windows-latest	5m 53s
Test Python 3.9 on windows-latest	7m 26s
Test Python 3.10 on windows-latest	8m 10s
Test Python 3.11 on windows-latest	9m 5s
	1h 0m 36s

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