Ups and downs notation

[TallKite]

Hi, inventor of ups and downs notation here. Unfortunately no one contacted me before adding ups and downs to SMuFL. Just want to make a few suggestions. I understand if it's too late to implement them.

1. The ups and downs should be fairly narrow, so a measure full of them stays fairly compact. This is the opposite of what Ra-Yo-Su said in issue Add arrow heads as accidentals. #124. (Everything else there is correct.) For example, when I add a down manually as a fingering, I use "v" in Arial Narrow. Another example, I actually prefer the look of the "open arrow" symbols U+EB88 and U+EB8C in section 4.97 over the official ups and downs.

2. The > and < symbols in 4.125 are named as more and less, but they stand for quintuple up and quintuple down. Their official names are quip and quid. (I think more and less is a HEWM thing?)

3. For larger edos, glyphs for double up and double down would be handy. The official names are dup and dud. Dud would look like a "w". Also glyphs for triple up and triple down, named trup and trud. All 4 should be as narrow as possible. Analogous to how a double flat is narrower than two single flats. Quadruple up is written down-quip (v>) so quadruple-arrow glyphs aren't needed.

4. Ups and downs are also used to notate rank-2 temperaments like Porcupine. In certain temperaments, an additional pair of microtonal accidentals are needed. These are typed as / and \ and named lift and drop.

5. Just an observation: Up/down and lift/drop are meant to be used in combination with each other and with sharps and flats. So v#, ^^b, ^/ and vv/# are all possible. Often score notation software doesn't let you assign more than one accidental to a note. So besides up, down, lift and drop, you would need many combo glyphs like upsharp, dropflat, etc. Dozens, maybe hundreds. And for JI accidentals the number is even greater. So ideally the software will soon allow multiple accidentals.