The datetime kind: chrono in front, Temporal underneath.

Every built-in kind, its vocabulary, and the two barrels over them.

Zone tables and the written-offset parser. No dependencies.

The unitless kind, and the one that accepts a bare number.

Nanosecond to week, canonical in seconds.

Currency recognition and formatting, with no rate table.

bit/s to Gbit/s, bridging data size and duration.

Beats per minute, and its bridge to duration.

The engine: normalize, tokenize, parse, solve, eval, print.

The kind comparisons land in.

Full instants at both ends, holidays optional.

m/s, km/h, mph, knots.

A sentence to a database query, in SQL or Mongo.

The money kind, rate snapshots, and the live-rate facade.

A clock time, with no date attached.

The layer a kind and a language are written in, with no engine in it.

Endpoints, ordering, windows — the machinery every range kind shares.

Numeric and measured ranges: `10–20 km`.

One unit, ratio 0.01.

The micro path: one parser, one algebra, one value-class factory.