Facet expand#1069

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Fil wants to merge 18 commits intomainfrom

Commits on Sep 30, 2022

Commits on Oct 4, 2022

facet expansion
Fil
committed

Commits on Oct 5, 2022

optimize for the common case of 1 facet
Fil
committed

Commits on Oct 6, 2022

Commits on Oct 7, 2022

use a map and export a registerChannel method; with a pretty unimaginative test for a customMark.
Fil
committed

Commits on Oct 10, 2022