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Changed ‘model.frame.glm()’ to use same logic as ‘model.frame.lm()’ (PR#19036, Isaac Gravestock).
Fix cases where ‘M’ and ‘X’ matrices could be spanning the same subspace in ‘mauchly.test()’, ‘sphericity()’ ‘anova.mlm()’, ‘anova.mlmlist()’. (PR#16166, originally reported in 2015 by Florent Aubry, essentially analyzed Feb. 2020 just before the corona crisis, triaged 2026 by Michael Chirico)