pub fn resolve_language_script(lang: Option<&str>) -> Option<String>Expand description
Resolve a BCP 47 language tag to its effective ISO 15924 script code.
An explicit script subtag takes precedence. Otherwise, the tag’s language
and region are expanded with CLDR likely-subtags data. Missing, malformed,
private-use-only, and unrecognized language evidence resolves to None;
this function never supplies a default script.