pub const TV1_METADATA_LEVEL: i16 = 24;Expand description
metadata.version at or above which transaction.version becomes a bootstrap default.
Both TV_1 and TV_2 bootstrap at 4.0-IV2 (level 24), so the per-release
default jumps 0 -> 2 at level 24. This is a bootstrap-default input only,
NOT a hard UpdateFeatures dependency.