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Method call with no-op proxy

I thought javascript proxy can handle method calls, but this simple script fail to do so.

let s = new String("12345")
let p = new Proxy(s, {})
let x = p.startsWith("1") // type error here

Gives me, TypeError: String.prototype.toString requires that 'this' be a String. I think startsWith method were called with this=Proxy. How to properly redirect proxy's target to 'this' ?

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