pub fn write_pair(out: &mut [u8], hi: u64, lo: u32)Expand description
Encodes the composite key (hi, lo) big-endian into the first 12 bytes
of out (hi first — it is the more significant component).
This is the layout of e.g. the temporal index key
[recorded_at: u64 | fact_id: u32].
§Panics
Panics if out.len() < 12.