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@ -301,9 +301,9 @@ As for now, it's important to know that such behavior of `__proto__` can become
The problem is that a visitor may choose `__proto__` as the key, and the assignment logic will be ruined (as shown above).
Later we'll see workarounds for the problem:
1. We'll see how to make an objects treat `__proto__` as a regular property in the chapter [](info:prototype-methods).
2. There's also study another data structure [Map](info:map-set) in the chapter <info:map-set>, which supports arbitrary keys.
There are two workarounds for the problem:
1. Modify the object's behavior to treat `__proto__` as a regular property. We'll learn how to do it in the chapter [](info:prototype-methods).
2. Using [Map](info:map-set) data structure which supports arbitrary keys. We'll learn it in the chapter <info:map-set>.
## Property existence test, "in" operator