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Headers (bytes) => Array(KeyLength, Key, ValueLength, Value)
  Set =>
	KeyLength => int32 <-----------------NEW size of the byte[] of the serialised key value
	Key => bytes <---------------------- NEW serialised string (UTF8) bytes of the header
    ValueLength => int32 <-------------- NEW size of the byte[] of the serialised header value
    Value => bytes <-------------------- NEW serialised form of the header value