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A general description is here.
‘coef()’ methods also gain a ‘complete = TRUE’ optional argument for consistency with ‘vcov()’.
The “default” (‘"lm"’ etc) methods of ‘vcov()’ have gained new optional argument ‘complete = TRUE’ which makes the ‘vcov()’ methods more consistent with the ‘coef()’ methods in the case of singular designs. The former (“back compatible”) behavior is now achieved by ‘vcov(*, complete=FALSE)’.