Guard against an include/extend cycle in on_ancestors_updated - #473
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`module Foo; module Util; include Foo; end; extend Util; end` is valid Ruby but made `on_ancestors_updated` recurse until SystemStackError. `include`/`prepend` cycles are rejected by Ruby itself, so `extend` was the first way to reach it. Add the same guard `each_descendant` has, plus scenarios for extend resolution.
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module Foo; module Util; include Foo; end; extend Util; endis valid Ruby but madeon_ancestors_updatedrecurse until SystemStackError.include/prependcycles are rejected by Ruby itself, soextendwas the first way to reach it. Add the same guardeach_descendanthas, plus scenarios for extend resolution.