store multiple values per key
Tie::Hash::MultiValue allows you to have hashes which store their values
in anonymous arrays, appending any new value to the already-existing
ones.

This means that you can store as many items as you like under a single
key, and access them all at once by accessing the value stored under the
key.

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: https://metacpan.org/release/Tie-Hash-MultiValue
