Function js::jsapi::INTERNED_STRING_TO_JSID

pub unsafe extern "C" fn INTERNED_STRING_TO_JSID(
    cx: *mut JSContext, 
    str: *mut JSString
) -> jsid

Only JSStrings that have been interned via the JSAPI can be turned into jsids by API clients.

N.B. if a jsid is backed by a string which has not been interned, that string must be appropriately rooted to avoid being collected by the GC.