static List<Span> doDecodeList(SpanBytesDecoder decoder, byte[] spans) {
    List<Span> out = new ArrayList<>();
    decoder.decodeList(spans, out);
    return out;
  }
ByteBuffer implementation of {@link #decodeOne(byte[])}

<p>Note: only use this when it is ok to modify the underlying {@link ByteBuffer#array()}.
zipkin/src/main/java/zipkin2/codec/SpanBytesDecoder.java