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A general description is here.
In the same spirit, ‘median(x)’ now gives an error for a data frame ‘x’ (it often gave nonsensical results).
Setting a Hershey font family followed by string height query would crash R.
‘R CMD javareconf -e’ would fail for some shells due to a shift error. Also the resulting paths will no longer contain ‘$(JAVA_HOME)’ as that can result in an unintended substitution based on ‘Makeconf’ instead of the shell setting.