State-Store State with undo, redo and watchers. A store holds one value and is the place a program asks for the current one. It is meant for values from HAMT, where keeping an old version costs almost nothing, so that undo is a matter of pointing at the version before. Requires a C compiler, perl 5.10 or later, and HAMT. 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 State::Store You can also look for information at: RT, CPAN's request tracker (report bugs here) https://rt.cpan.org/NoAuth/Bugs.html?Dist=State-Store Search CPAN https://metacpan.org/release/State-Store LICENSE AND COPYRIGHT This software is Copyright (c) 2026 by LNATION . This is free software, licensed under: The Artistic License 2.0 (GPL Compatible)