Undocumented `alwaysByViewport` option

[GeoMarkou]

In the align.overflow configuration there is an alwaysByViewport option offered by dom-align:

if alwaysByViewport is true, the it will adjust if node is not inside viewport

This solved an issue I was having with a large page that scrolled horizontally and vertically, the tooltip would disappear off the side of the page. It would be great if this was documented somewhere.