.updateDeep(target, source)

Updates the values (and properties if map-like) of target to match the values of source.

For map-like objects, every enumerable property on target is copied:

var target = {name: {first: "Justin"}, age: 34};
var source = {name: {last: "Meyer"}};
var restult = canReflect.assignDeep(target, source);
target //->  {name: {last: "Meyer"}}

An object can control the behavior of assignDeep using the can.updateDeep symbol.

For list-like objects, a diff and patch strategy is used. This attempts to limit the number of changes.