In spatial notation, a single straight flag is used as the mandatory flag design (as an extension of the beam). In traditional notation, however, straight flags function simply as stylistic alternates, but AFAIK it’s not uncommon to mix spatial and traditional notation in the same score, and to use straight flags consistently in such cases.
This mixture of stylistic and semantical implications complicates the decision of whether or not a promotion of these glyphs is warranted, but given that straight flags may indicate a certain type of notation, I think it may be logical to promote them. An added advantage is the space this will free up in the optional characters range.
Knut
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