sdd:number
sdd:number is one of the frozen primitive layer's members (spec §4.5) — the value of sdd:primitive on a sdd:Datum that renders as a number. Unit handling for numeric data remains an open design item; today sdd:number carries the bare numeric value.
Like sdd:text, a sdd:number datum follows the primitive path? value? data-line shape: a sdd:binds path grounds it in a fact, and sdd:value holds the materialized cache.