- appendList: one home for the List newline-join rule (was duplicated
across accumulate and set)
- fold the redundant Int64 getter into Int; drop the truthy helper for
the shared boolWord vocabulary
- add Opt.Metavar so help derives the value placeholder from data
instead of branching on the option name (seed-time)
No behavior change; --help output is byte-identical.
Hojun-Cho
2d99c39604