How do I limit utf8 text rotation as non-utf8 text?

Nobody has claimed this yet.

**mapbox-gl-js version**:
latest

### Question
I have text which is mixed with utf8 and non-utf8(number) string. then there's three kind of rotation. left-to-right, right-to-left, top-to-bottom. the last one - top-to-bottom - is only appeared with utf8 text. that's okay unless the text includes numbers. when the text string has numbers, it gives ambiguousness on how to read.
e.g. problems:
okays:

If the text string contains only utf8 text or doesn't contains at all, It's fine. but like the capture images, when the text string contains utf8 and non-utf8 text together, the rotation should be non-utf8 way. but I couldn't find a way to limit the rotation to be left-to-right or right-to-left. If there's no option for this, where on the code should I customize?

Thanks,

Start by checking the linked help documentation and the Mapbox GL JS text-rotation guidance, then compare the reported mixed UTF-8 and numeric text behavior with the documented options. The issue names no source file or test, so first clarify whether the expected outcome is documentation of an existing option or a code change; completion should include a documented, reproducible answer.

Written by the indexing model from the issue text.