See illguts and add up the individual HEs, HEKs, SVs, etc. A simple scalar value (SV) already has 4 fields plus the actual data body. And even for the array data type, which is less complex than a hash, an empty entry adds up to around 80 bytes administrative overhead.

In reply to Re^6: Constructing a hash - why isn't my regex matching anything by Anonyrnous Monk
in thread Constructing a hash - why isn't my regex matching anything by perl_mystery

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