reverse() modifies its argument
After calling reverse($var), the value of $var is changed to be in reverse order.
reverse is implemented as
arg is an iterator. The problem is that (a) if
arg is a ForArray iterator, then
reverse() modifies its argument in-situ.
So the code needs to ensure that the array is copied before calling
reverse()@, or perhaps to avoid the @expand() operation and prepend each item returned by the iterator to a target array.
(Reported informally by John Lumley)
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