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A general description is here.
Sys.getenv() could read incorrectly non-ASCII values.
poly() has additional checks against user error (as in PR#11243).
The C macro 'allocString' is deprecated -- use 'mkChar',
or 'allocVector' directly if really necessary.
plot.default(x, y) now should correctly dispatch to Axis() methods whether y is NULL or not.
Plotting symbols with separate border and fill colours (e.g., plot(pch = 21)) now works with transparent 'col', but opaque or semi-transparent 'bg'. Previously, if 'col' was transparent then 'bg' was ignored and nothing was drawn.
list.files() gains a 'ignore.case' argument, to allow case-insensitive matching on some Windows/MacOS file systems.