Reference: STORESIZE (Perl in a Nutshell)

Perl in a Nutshell

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STORESIZE

STORESIZE this, count

Sets the total number of items in the tied array associated with object this to count. If this makes the array larger than the class's mapping for the array, then undef should be returned for new positions. If it makes the array smaller than the mapping, then entries beyond count should be deleted.

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