"Martin Stjernholm, Roxen IS @ Pike developers forum" 10353@lyskom.lysator.liu.se writes:
No, the insert lfun is not `[]=. The difference is that the insert operation always adds an element, causing a duplicate index if necessary. On mappings it would either be undefined or throw an error if the index already exists.
Ah, I see. So there is need for a true insert operator...