References

summary
public	F simpleDeepAssign(target: Object, source: Object, rest: ...Object) Recursively copy the values of all enumerable own properties from a source item or more to a target item if the both items are objects
private	F deepAssign(target: Object, source: Object) Recursively copy the values of all enumerable own properties from a source item to a target item if the both items are objects
private	F deepAssignObject(target: Object, source: Object) Recursively copy the values of all enumerable own properties from a source object to a target object
private	F isArray(item: *): boolean Check if it is an array
private	F isObject(item: *): boolean Check if it is an object