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Work around a bug in OS X Yosemite where key environment variables may be duplicated causing issues in subprocesses. The duplicates are now removed on R startup (via Rprofile). (PR#16042)
Adjust X11 auto-launch detection in DISPLAY on OS X to recognize latest XQuartz.
‘hist(x, breaks)’ is more robust in adding a small fuzz to few breaks when some are very large. (PR#15988)