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The C function mkCharLenCE now no longer reads past 'len' bytes (unlikely to be a problem except in user code). (PR# 14246)
On systems without any default LD_LIBRARY_PATH (not even /usr/local/lib), [DY]LIB_LIBRARY_PATH is now set without a trailing colon. (PR#13637)
More efficient utf8ToInt() on long multi-byte strings with many multi-byte characters. (PR#14262)
aggregate.ts() gave platform-depedent results due to rounding error for ndeltat != 1.
package.skeleton() sometimes failed to fix filenames for .R or .Rd files to start with an alphanumeric. (PR#14253)
splinefun(*, method = "monoH.FC") was not quite monotone in rare cases. (PR#14215)
Rhttpd no longer crashes due to SIGPIPE when the client closes the connection prematurely. (PR#14266)