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Add a test to ensure this won't happen again.
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Doesn't do that much, but it's a good idea for slsets as well because
it makes it unlikely that plist changes are ever observed, because
there's no thread switching.
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This implements sets of symbols *as lists*, like in the srfi-1 lset
operations. It maintains the benefit of using lists for everything,
but not having to pay the quadratic performance penalty that srfi-1
entails. We achieve this by using plist operations to "mark" items
so we have to visit the list "set" only a fixed number of times.
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