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Description
ICU4C's uloc_isRightToLeft
doesn't seem to provide this information, but at least ICU4X's LocaleDirectionality
has three possible return values:
Direction::LeftToRight
Direction::RightToLeft
None
for scripts likeZzzz
orZyyy
.
See also https://docs.rs/icu/latest/icu/locid_transform/struct.LocaleDirectionality.html#method.get.
I'm not sure if there's an easy way to detect the unknown direction case in ICU4C, so I don't know if there's much support to support this case in the spec. But I guess we could at least document this case more clearly in the spec by adding an <emu-note>
to CharacterDirectionOfLocale
to describe that "ltr"
is returned even when no direction is known.
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