When using streaming SSR decodeText is called repeatedly with incoming
chunks of data. In that case a multi-byte character may occasionally
split between chunks, causing corruption. By setting the TextDecoder
option 'stream' to true, and reusing the same TextDecoder instance,
TextDecoder will memorise “unfinished” characters and decode them when
the next chunk comes.
The `readableStreamTee` util is only used by server/render.tsx, but ended up in the middleware runtime bundle. So it's better to add all the utils in one place, and we can remove them once upstream implementation of ReadableStream is ready.
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`
## Documentation / Examples
- [ ] Make sure the linting passes by running `yarn lint`
