The menu lists all prefab arches and allows to edit them with sliders.
Arches can be saved and restored.
"archvertex" now returns the old value of the vertex, and if the vertex
argument is omitted, doesn't change it.
enumalias prefix
Lists all persistent aliases that start with prefix. Returns a table
with two entries per alias: 1) full name and 2) name without prefix
DOCREF archvertex enumalias
ac-stef
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