pub fn first_index(&self) -> u64 {
        if let Some(i) = self.unstable.maybe_first_index() {
            return i;
        }
        self.storage.first_index().unwrap()
    }
/// Returns the first index of unstable or storage
Returns the first index of unstable or storage
Returns the first index of unstable or storage
pub fn first_index(&self) -> u64 {
        if let Some(i) = self.unstable.maybe_first_index() {
            return i;
        }
        self.storage.first_index().unwrap()
    }
pub fn first_index ( & self ) -> u64 { if let Some ( i ) = self . unstable . maybe_first_index ( ) { return i ; } self . storage . first_index ( ) . unwrap ( ) }
Returns the first index of unstable or storage
Returns the first index of unstable or storage
&self