-=head2 C<< new name => $name, mapper => $mapper, target => $target, [ user_constraint => sub { ... } ] >>
+=head2 C<< new name => $name, mapper => $mapper, target => $target >>
Constructs a type constraint object that will attempt to autocoerce objects that are not valid according to C<$target> by loading the class returned by C<$mapper>.
Constructs a type constraint object that will attempt to autocoerce objects that are not valid according to C<$target> by loading the class returned by C<$mapper>.