Constant GIT_STATE_PARTIAL 

pub const GIT_STATE_PARTIAL: u8 = _; // 4u8

More records for this state_id follow. A snapshot past the per-message byte budget spans several GIT_STATE messages sharing one state_id; the client accumulates and replaces its map on the chunk with this bit clear, so it never observes a half-built snapshot. Only the final chunk is acked, so the one-in-flight pacing is unchanged.