docs: private String readAttributeAsFixedLengthString(Attribute attribute, int bufferSize)
              throws UnsupportedKerasConfigurationException {
          synchronized (Hdf5Archive.LOCK_OBJECT) {
              VarLenType vl = attribute.getVarLenType();
              byte[] attrBuffer = new byte[bufferSize];
              BytePointer attrPointer = new BytePointer(attrBuffer);
              attribute.read(vl, attrPointer);
              attrPointer.get(attrBuffer);
              vl.deallocate();
              return new String(attrBuffer);
          }
      }