Re: [w3c/push-api] Support throwing exception from text method during UTF-8 decode (#276)

We depend on the [UTF-8 decode](https://encoding.spec.whatwg.org/#utf-8-decode) operation defined in the Encoding spec. The default error mode for decoders [is defined to be `replacement`](https://encoding.spec.whatwg.org/#concept-encoding-run) instead of `fatal`, which means we shouldn't throw. Replacement characters will be inserted instead.

Is my reading correct, @annevk? That matches at least Chrome's implementation.

Would we want to explicitly override the error mode? I'm inclined not to, since our closest sibling method on [`Body`](https://fetch.spec.whatwg.org/#dom-body-text) [doesn't either](https://fetch.spec.whatwg.org/#concept-body-package-data).

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