code: function(x, keys_, value) {
    if (isnt(x) || isnt(keys_) || isnt(value))  { return false; }
  
    var keys  = _.isArray(keys_) ? keys_ : keys_.split('.').map(function(x) {return x==='' ? null: x});
  
    if (anyIsnt(keys))                          { return false; }
  
    return keys;
  }
docs: Sets value on object (this is the workhorse for setOn, setOnn, setOnna.)
  
  Returns the sanitized keys, or false.