de> is not <code>false</code>) then that takes precedence over the settings at the timeline level. Current behavior is
    that if any of the item-level actions are not specified, those items get <code>undefined</code> value (rather than inheriting from the timeline level). This may change
    in future major releases, and code that specifies all item level values will handle major release changes better. That is, instead of using
    <code>editable: {updateTime : true}</code>, use <code>editable: {updateTi