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The parser now enforces C99 syntax for floating point hexadecimal constants (e.g. ‘0x1.1p0’), rather than returning unintended values for malformed constants. (PR#15234)
Subsetting 1D arrays often lost dimnames (PR#15301).
Unary ‘+’ on a logical vector did not coerce to integer, although unary ‘-’ did.
‘model.matrix()’ now works with very long LHS names (more than 500 bytes). (PR#15377)
‘integrate()’ reverts to the pre-2.12.0 behaviour: it sometimes reported error estimates that were exceeded. (PR#15219)