Re: [whatwg/encoding] TextEncoder#encode - write to existing Uint8Array (#69)

> I don't trust it. In particular, in Blink once you pass a string to an IDL method it turns into an embedder string, which doesn't support zero-copy substrings.

Do we need to care about the characteristics of the substring operation on the C++ side of WebIDL? It seems to me the side that matters here is the JS side.

Or do you mean that in Blink a JS string that points to the buffer of another JS string gets copied on the IDL layer but a JS string that is the exclusive owner of its buffer doesn't get copied?

> Even if the copy is free, it still creates more garbage that has to be collected at some point.

I defer to JS engine developers on whether this matters.

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