pub fn script_class(lang: Option<&str>) -> Option<ScriptClass>Expand description
Resolve the effective script class from positive script evidence only.
Returns None when the language tag carries no usable evidence for either
supported class, including known but unsupported scripts such as Cyrillic —
the positive-evidence rule (MULTILINGUAL.md §3.2a). Callers realizing wrap
punctuation should fall back to the style-declared default via
wrap_script_class rather than treating None as a script itself.