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

> Going back to the issue of string view or start index into a string: Do we need that or can we trust the JS substring operation not to copy the underlying buffer?

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.

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

Requiring the caller to allocate 3x string length might be an option. Blink's implementation of encode() does that internally anyway, so it wouldn't be worse.

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