use ByteString unsafe methods where it is ok #4021
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Pekko/Akka ByteString supports unsafe methods to create ByteStrings without cloning arrays or output the underlying array data (again without cloning). This is ok if no the other code that works with the arrays isn't modifying the array data.
Pekko 1.1 also has a ByteString.asInputStream method which is more efficient than getting an array and wrapping as ByteArrayInputStream.