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‘seq.default()’ is more careful to return an ‘integer’ (as opposed to ‘double’) stored result when its arguments are large and/or objects; see comment #9 of Suharto Anggono's PR#17497.
‘$.data.frame’ had become an expensive version of the default method, so has been removed. (Thanks to Radford Neal for picking this up and Duncan Murdoch for providing a patch.)
‘setClassUnion()’ no longer warns, but uses ‘message()’ for now, when encountering “non local” subclasses of class members.