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pmatch() uses hashing in more cases and so is faster at the expense of using more memory. (PR#15697)
For a formula with exactly 32 variables the 32nd variable was aliased to the intercept in some C-level computations of terms, so that for example attempting to delete it would remove the intercept instead (and leave a corrupt internal structure). (PR#15735)
‘anyDuplicated()’ silently returned wrong values when the first duplicate was at an index which could not be stored as in an integer vector (although a lot of RAM and patience would have been needed to encounter this).