By default all nodes are allowd to nest within another, each node defines a list (a bitstring we call mask) of disallowd desendant types.
mask
Assume the mask do not distinguish direct or indirect child, so it's resonable to maintain a total mask combining all ancestors' masks.
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By default all nodes are allowd to nest within another, each node defines a list (a bitstring we call
mask) of disallowd desendant types.Assume the
maskdo not distinguish direct or indirect child, so it's resonable to maintain a total mask combining all ancestors' masks.