Module sequence 

Sequence handle.

A Sequence is an auto-incrementing (or decrementing) counter backed by a single key-value record in a Database. The persistent record stores the next batch boundary so that multiple handles can share the same database key without requiring coordination on every call.

Record format (ported exactly from the)

byte 0   : version (always 1)
byte 1   : flags
             bit 0 (FLAG_INCR) — sequence increments
             bit 1 (FLAG_WRAP) — wrap-around allowed
             bit 2 (FLAG_OVER) — overflow has occurred
bytes 2+ : range_min  (big-endian i64, 8 bytes)
bytes 10+: range_max  (big-endian i64, 8 bytes)
bytes 18+: stored_value (big-endian i64, 8 bytes)

Total: 26 bytes. uses packed-long encoding; we use fixed big-endian i64 for simplicity (compatible with the noxu-persist pattern).

Structs

Sequence

A handle for manipulating a sequence record stored in a Database.