pub fn encode_map_header(out: &mut Vec<u8>, count: i64)Expand description
%<count>\r\n — a map header. Follow with count × 2 sub-replies
(key₁ value₁ key₂ value₂ …). The count is the pair count, not
the element count.
Used for replies that RESP2 ships as *2N array-of-pairs — HGETALL,
CONFIG GET, XINFO STREAM. The map header is a single byte plus the
count digits; vs RESP2’s *2N it saves zero header bytes but the
payload typically saves 4 B per pair by allowing simple-string keys.