Merge pull request #542 from igerber/fix/cr2-bm-se-degenerate-varianc… #734

Job	Run time
Validate docs deps install on Python 3.9 (floor compat)	38s
Validate doc snippets + doc-deps integrity	8m 37s
Sphinx HTML build (-W warnings as errors)	2m 39s
	11m 54s

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