Documentation for method
add_fallback assembled from the following types:
method add_fallback(, , )
Installs a method fallback, that is, add a way to call methods that weren't statically added.
$calculator must be callables that receive the invocant and the method name once a method is called that can't be found in the method cache.
$condition returns a true value,
$calculator is called with the same arguments, and must return the code object to be invoked as the method, and is added to the method cache.
$condition returns a false value, the next fallback (if any) is tried, and if none matches, an exception of type X::Method::NotFound is thrown.
User-facing code (that is, code not dabbling with metaclasses) should use method