Well, some of the array operations have had "random-" (or rather hash-) order in their result. Explicitly saying that the order is undefined or random makes sure that nobody writes code that relies on the order.
/ Henrik Grubbström (Lysator)
Previous text:
2004-09-19 10:33: Subject: Re: duplicates in a|b
good point, but claiming its random sounds wierd, something like "the current algorithm..." or not explaining it at all seems better.
greetings, martin.
/ Brevbäraren