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‘which(x)’ now also works when ‘x’ is a long vector, thanks to Suharto Anggono's PR#17201.
‘setClassUnion()’ no longer warns, but uses ‘message()’ for now, when encountering “non local” subclasses of class members.
If environment variable ‘_R_METHODS_SHOW_CHECKSUBCLASSES’ is set to true, the internal ‘.checkSubclasses()’ utility prints debugging info to see if it is used at all after the ‘methods’ package has been built. On the other hand, setting ‘_R_METHODS_DONT_CHECKSUBCLASSES’ to true, replaces ‘.checkSubclasses()’ by a no-op, experimentally, as it may be unneeded (after ‘methods’ building).
‘writeLines(readLines(fnam), fnam)’ now works as expected, thanks to Peter Meissner's PR#17528.