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Hello! I am trying to migrate multiplatform common code from Ktor 2 -> 3. Previously I used `OutgoingContent.WriteChannelContent()` where I could directly write into `channel: ByteWriteChannel`.
Is there a way to do that in Ktor 3?
- `ByteWriter.writeBuffer` is marked as `@InternalAPI`, as are all the write operations in `ByteWriteChannelOperations.kt`.
- `ByteWriteChannel.asSink()` is only available for jvmAndPosix

For now, the only solution I found was to use `OutgoingContent.ByteArrayContent()` instead. Thanks for any pointers!

Can you please describe your use case in more detail? I can write directly to the channel with the following code:
```object : OutgoingContent.WriteChannelContent() {
    override suspend fun writeTo(channel: ByteWriteChannel) {
        channel.writeStringUtf8("Hello")
        channel.writeByteArray(ByteArray(0))
    }
}```

Sorry, that was a brain fart on my part. I first saw that `writeBuffer` in `ByteWriteChannel` is marked `@InternalAPI`. Then when looking at the functions such as `writeStringUtf8` I didn't notice it was marked `@OptIn(InternalAPI::class)` not `@InternalAPI` .