sub import {
shift;
- # Not that unimport is the prefered form since import's don't
+ # Not that unimport is the preferred form since import's don't
# accumulate well owing to the 'only ever add opmask' rule.
# E.g., perl -Mops=:set1 -Mops=:setb is unlikely to do as expected.
opmask_add(invert_opset opset(@_)) if @_;