pub trait Index: Sealed {
// Required methods
fn index_into<'v>(&self, v: &'v Llsd) -> Option<&'v Llsd>;
fn index_into_mut<'v>(&self, v: &'v mut Llsd) -> Option<&'v mut Llsd>;
fn index_or_insert<'v>(&self, v: &'v mut Llsd) -> &'v mut Llsd;
}