copyFrom warning + callback example

copyfrom initiated
https://groups.google.com/d/msg/f3-framework/jcep_AVmthQ/-vmwBunHjoQJ

but both jig.mapper & mongo-mapper have a copyfrom method.

??? Do U think it's better to put the blurb about it in
http://fatfreeframework.com/databases#beyond-crud  ???   and refer to it
in the 3 mappers