support adding atoms 'zero-copy' #1617

Job	Run time
Wheel on macos-latest py-3.7	4m 19s
Checks	54s
Wheel on ubuntu-latest py-3.7	2m 33s
coverage	7m 48s
Wheel on windows-latest py-3.7	4m 27s
Run fuzz targets (macos-latest, 3.7)	48m 3s
Unit tests (macos-latest, 3.7)	8m 40s
Run fuzz targets (ubuntu-latest, 3.7)	20m 53s
Unit tests (ubuntu-latest, 3.7)	3m 14s
Unit tests (windows-latest, 3.7)	6m 3s
Upload to PyPI	32s
	1h 47m 26s

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