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A general description is here.
‘sapply()’ with default ‘simplify = TRUE’ and ‘mapply()’ with default ‘SIMPLIFY = TRUE’ wrongly simplified language-like results, as, e.g., in ‘mapply(1:2, c(3,7), FUN = function(i,j) call(':',i,j))’.
Long titles for help pages were truncated in package indices and a few other places.
Additional utilities now work correctly with subclasses of ‘"environment"’ (‘rm’, locking tools and active bindings).
Reference S4 class creation could generate ambiguous inheritance patterns under very special circumstances.
‘`[[<-`’ turned S4 subclasses of ‘"environment"’ into plain environments.