Re: [whatwg/encoding] Consider adding TextEncoder.containsLoneSurrogates() static (#174)

@RReverser Catching exceptions [is about ~135 times slower than returning `null`](https://jsperf.com/try-catch-performance3), so we'd really like to avoid that.

And you might have to put in extra checking to make sure that you're catching the *right* exception (and not some unrelated exception).

It's quite common for DOM APIs to return `null` on failure. And it doesn't require synthesizing an `Error` object and sending it to Rust.

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