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Here’s what they said in the proposal

https://github.com/tc39/proposal-private-fields/blob/master/...

Not convincing. When you add a new feature, you can change the parser. So internally, you could rewrite every usage of this.x to this.#x (or anything else) upon reading it.

Edit: wrt encapsulation, will the proposed solution work when a class marks the same field private as the one it extends?

Breaking this.x being equivalent to this['x'], and making this.x quietly change its meaning depending on where the function containing it is located and on the presence or absence of a private field with a corresponding name, seems confusing.

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