Documentation issue for whole rests.

[rpatters1]

The documentation for the rest object states:

This vertical position is the "origin point" from which the rest symbol's SMuFL glyph is drawn. For example, a quarter rest is drawn from its vertical midpoint.

It would be very helpful to spell out exactly what this means for a whole rest. The standard 5-line staff Finale, for example, specifies staff positions for all rests as the middle staff line, including the whole rest. That means that the origin point of a whole rest in Finale is actually below the rest. (This is how Finale's pre-SMuFL music fonts were designed as well, including grandpa Adobe Sonata I believe.)

MuseScore also has some shenanigans around whole rest positioning, but I am not certain exactly how they work.

From the hyperlink to the SMuFL spec, I gather that SMuFL specifies the whole rest's origin point at the top left. I am only asking that this particular situation be spelled out in the mnx spec. Given that it appears that the whole rest is the lone exception to having a standard position on the middle staff line, I do not think the spec should rely on a link to another source to make that clear. Especially since past practice was otherwise.