HAMT Persistent maps, sets and vectors. A persistent container is one where an update returns a new container and leaves the one it was called on exactly as it was. The two share nearly all of their memory, so keeping the old one costs a few small nodes and not a copy. Requires a C compiler and perl 5.10 or later. No runtime prerequisites. INSTALLATION To install this module, run the following commands: perl Makefile.PL make make test make install SUPPORT AND DOCUMENTATION After installing, you can find documentation for this module with the perldoc command. perldoc HAMT You can also look for information at: RT, CPAN's request tracker (report bugs here) https://rt.cpan.org/NoAuth/Bugs.html?Dist=HAMT Search CPAN https://metacpan.org/release/HAMT LICENSE AND COPYRIGHT This software is Copyright (c) 2026 by LNATION . This is free software, licensed under: The Artistic License 2.0 (GPL Compatible)