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‘vcov(<mlm>)’ is more efficient via new optional arguments in ‘summary.mlm()’.
The default method of ‘summary()’ gets an option to choose the _kind_ of ‘quantile()’s to use; wish of PR#17438.
‘vcov(<empty mlm>)’ and hence ‘confint()’ now work (via a consistency change in ‘summary.lm()’).
‘confint(<multivariate lm()>)’ now works correctly; reported on R-devel by Steven Pav.