Spotted during code review; no known impact.

StreamEncoder.writeBytes assumes (and asserts) that all bytes will be written to the target channel in a single invocation of write. If a channel only consumes a part of the provided ByteBuffer, any excess is lost.

The attached test creates a writer on a channel that only consumes one byte at a time from the passed ByteBuffer. It should eventually consume all characters. Instead it either loses characters, or asserts if system assertions are enabled.