Improve and document handling of PointerToRawData values #42

Job	Run time
Python 3.7 on ubuntu-latest	1m 51s
Python 3.8 on ubuntu-latest	1m 57s
Python 3.9 on ubuntu-latest	1m 57s
Python 3.10 on ubuntu-latest	2m 3s
Python pypy3.9 on ubuntu-latest	8m 19s
Python 3.7 on macos-latest	2m 24s
Python 3.8 on macos-latest	3m 7s
Python 3.9 on macos-latest	2m 51s
Python 3.10 on macos-latest	2m 39s
Python pypy3.9 on macos-latest	21m 38s
Python 3.7 on windows-latest	2m 54s
Python 3.8 on windows-latest	2m 47s
Python 3.9 on windows-latest	2m 47s
Python 3.10 on windows-latest	3m 2s
Python pypy3.9 on windows-latest	14m 41s
Coverage	0s
	1h 14m 57s

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