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A general description is here.
‘xtabs()’ works more consistently with ‘NA’s, also in its result no longer setting them to ‘0’. Further, a new logical option ‘addNA’ allows to count ‘NA’s where appropriate. Additionally, for the case ‘sparse=TRUE’, the result's ‘dimnames’ are identical to the default case's.
‘tapply()’ gets new option ‘default = NA’ allowing to change the previously hardcoded value.
‘qbeta()’ underflowed too early in some very asymmetric cases. (PR#17178)