For what it's worth, bluebird promises detect the error and reject with: ``` TypeError: Chaining cycle detected for promise #<Promise> ```
So it's both possible and not a performance issue. For this case, a WeakMap is not needed for this case. https://jsfiddle.net/41ez2b6d/ . > We ran into code "in the wild" Yes, while I've never run into this I've talked to several people who have ran into this error - so it's definitely "a thing".
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