- platform::mode documents the on-disk mode-bit layout (bits 31..19 =
d a l T L D p S u g c t ?, low 9 bits = permissions).
- The snapshot module documents the LEB128 / zig-zag varints and the RFC
3339 JSON timestamps, and states that snapshots written by mapsize 1.x
load unchanged.
- Renames: GoTime -> JsonTime, go_duration -> fmt_duration, fixture
testdata/go.msz -> testdata/v1.2.0.msz (a snapshot written by mapsize
1.2.0), loads_go_snapshot -> loads_1_2_snapshot.
- --log / --log-level help says they are accepted and ignored.