This module provides multi method dispatch based on Moose type
constraints. It does so by providing a "multi" keyword that extends the
"method" keyword provided by MooseX::Method::Signatures.
When invoking a method declared as "multi" a matching variant is being
searched in all the declared multi variants based on the passed parameters
and the declared type constraints. If a variant has been found, it will be
invoked. If no variant could be found, an exception will be thrown.