Tim van der Meij 4c2e056796
Convert the RefSet primitive to a proper class and use a Set internally
The `RefSet` primitive predates ES6, so that most likely explains why an
object is used internally to track the entries. However, nowadays we can
use built-in JavaScript sets for this purpose. Built-in types are often
more efficient/optimized and using it makes the code a bit more clear
since we don't have to assign `true` to keys anymore just to indicate
their presence.
2020-06-07 19:01:29 +02:00
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