Function::fallback::coreorpp provides functions that use non-core xs modules (for best speed, reliability, feature, etc) but falls back to those that use core xs or pure-perl modules when the non-core xs module is not available.

this module helps when you want to bootstrap your perl application with a portable, dependency-free perl script. in a vanilla perl installation (having only core modules), you can use app::fatpacker to include non-core pure-perl dependencies to your script.