Interface NavigationStep

Epoch ms of the navigation.

Session ordinals consumed, before this screen's own, by screens no request names: the app handed them out and the chain never shows them. An observed fact of the app version a flow reproduces (Android 451: the SERP is 4, the profile opened from it 7, so that transition skips 2; owner decision 2026-10-20). The count belongs to the transition — the flow that models the edge from one screen to the next declares it from a recording — never to a caller's input of a public brick. A whole number ≥ 0; absent is 0. Outside a session there is no ordinal to skip.