Implement Deref for Atom #1890

Job	Run time
Wheel on macos-12 py-3.8	2m 39s
Checks	57s
Wheel on ubuntu-latest py-3.8	2m 47s
Wheel on windows-latest py-3.8	2m 40s
coverage	8m 41s
Run fuzz targets (macos-12, 3.8)	34m 24s
Run fuzz targets (ubuntu-latest, 3.8)	13m 2s
Unit tests (macos-12, 3.8)	9m 37s
Unit tests (ubuntu-latest, 3.8)	3m 40s
Unit tests (windows-latest, 3.8)	6m 32s
Upload to PyPI	31s
	1h 25m 30s

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