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Calling ‘lm.wfit()’ with no non-zero weights gave an array-overrun in the Fortran code and a not very sensible answer. It is now special-cased with a simpler answer (no ‘qr’ component).
‘supsmu()’ could read/write outside its input vectors for very short inputs (seen in package ‘rms’ for ‘n = 4’).
‘contourLines()’ now checks more comprehensively for conformance of its ‘x’, ‘y’ and ‘z’ arguments (it was used incorrectly in package ‘R2G2’).