Hi,
do bopomofo glyphs allow for tone attachment?
"It is important to understand that bopomofo tone marks are not combining characters. They are regular spacing characters that are stored after the sequence of bopomofo letters that make up a syllable."
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https://zh.wikipedia.org/wiki/%E6%B3%A8%E9%9F%B3%E7%AC%A6%E8%99%9F
The tone marks do not combine with the base character.