measure payload length in utf-8 #15
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Encountered a problem when using workspaces that contain utf-8 characters in them.
The problem arises from the fact that the payload length is measured in "rune" count, not byte count.
This PR makes use of Buffer.bytesLength in utf-8 (which is the most common encoding in the wild nowadays).
There may be other places where this might need to be applied but I haven't checked.