It has just come to my attention that U+1D159 MUSICAL SYMBOL NULL NOTEHEAD is not default ignorable, even though it has no visible glyph appearance and no advance width in text, just like the various Hangul jamo fillers that *are* default ignorable. Is there a technical reason for this or is it just an oversight?
- Why isn't MUSICAL SYMBOL NULL NOTEHEAD default ignorable? Charlotte Buff
