You can only assign lists to arrays, but what you probably forgot is that not all lists need parentheses. So effectively, this happens:
@array = (undef);
It makes your array be a single element array with undef as its only value. To empty an array, use an empty list (because there is no scalar this time, you need the parens):
@array = ();
To really destroy the array, and also reset its MAX, use:
See also: undef
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