A trait for attrs that should not be copied while cloning.
with qw(MooseX::Clone); has _some_special_thingy => ( traits => [qw(NoClone)], );
Sometimes certain values should not be carried over when cloning an object.
This attribute trait implements just that.
If the \*(C`init_arg\*(C' param is set (that means an explicit value was given to \*(C`clone\*(C') sets the attribute to that value. Otherwise calls \*(C`clear_value\*(C' and \*(C`initialize_instance_slot\*(C'.