You'll get that situation if you have something like 

while (...each(%h)...) {
   ...
   last if ...;
   ...
}

[download]

The solution is 

keys(%h);  # Reset iterator.
while (...each(%h)...) {
   ...
   last if ...;
   ...
}

[download]

Note that keys does not actually compute the list of keys in void context.

In reply to Re^3: keys and values order on a hash by ikegami
in thread keys and values order on a hash by citromatik

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