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A general description is here.
dQuote() and sQuote() now use directional quotes by default under RGui. You might prefer options(useFancyQuotes=FALSE) when running Rterm if the console font does not have these quotes: see the rw-FAQ.
'=' within -e expression is no longer interpreted as setting
an environment variable.
'=' within '-e expression' on the command line is no longer interpreted as setting an environment variable.
Using a modal widget from Rterm (e.g. select.list) is now far more likely to be forced to the front.
Rcnmd INSTALL --docs=txt etc works (for a single type, except 'chm' which is equivalent to 'all' nowadays).
new.packages() and update.packages() failed when called on an empty library, since old.packages() threw an error. old.packages() now returns NULL (as documented) in that case.
Builds on Mac OS X 10.4 or higher now allocate enough space in the binary headers to relocate dependent libraries into the framework.