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In thinking about how to make a 'bind' (aka, reflect and atlases) Node
implementation, some interesting stuff comes up: despite being all
one concrete Node implementation, it needs specialization (for the
reflect.Value bound inside, specifically); and 'bind' nodes don't
*necessarily* have a schema and a typed.Node associated with them,
so the existing comments about specializing using Type info don't
actually apply.  So!  What do?

These comments are a tad hypothetical (and have been on my uncommitted
working tree for a while, so hopefully they're not *too* stale; I just
want to get them in history somewhere rather than keep dancing my
patches around them)... but there's almost certainly something to
address somewhere in this area.