Arpeggiato wiggles

[notator]

For me, an arpeggiato is a vertical wiggle (similar to the horizontal trill wiggle) to the left of a chord. Glissando wiggles have an arbitrary angle.
So I think the Arpeggiato glyphs (U+EAA9 -> U+EAAE) should be rotated by 90 degrees in
https://w3c.github.io/smufl/gitbook/tables/multi-segment-lines.html
In particular, EAAD should point upwards and EAAE should point downwards.

[dspreadbury]

No, due to the way in which fonts for nominally left-to-right writing systems are rendered by all current font technologies, it is more practical to have these glyphs drawn horizontally so that a longer wiggle can be created simply by drawing a run of the same glyphs over and over again, and then have that drawn string rotated at draw time.

[notator]

Okay, but to avoid any confusion, I think the Implementation Notes should include examples of both glissando and arpeggiato construction using the defined glyphs.
(I used vertically oriented wiggles in Stockhausen scores. They were used in text strings containing carriage returns. The strings were subject to the usual graphic and text transformations...)