openShapes() skipped every schema node it had already visited, so one
z.unknown() instance reused across four fields counted once, and a
baselined schema could gain any number of open fields that share a node
without its count moving. z.map(), z.set() and z.custom() were not walked
at all, so an open value inside them counted nothing.
An open spot now counts once per path it sits at, and the visited set is
only a guard on the ancestor chain, so a recursive z.lazy() still
terminates. The same kind at the same path is listed once, which keeps the
two sides of an intersection from counting a shared field twice. Map keys
and values and set values are walked, and z.custom()/z.instanceof() count
as a custom open shape. The request schemas hold the same 75 open shapes
under the new walk, so the baseline does not change; the spec covers
reuse, recursion and the new types.
Maurice
9d6debc591