function initializeProperties(jsonHeader) {
  const properties = {};

  if (!defined(jsonHeader)) {
    return properties;
  }

  for (const propertyName in jsonHeader) {
    if (
      jsonHeader.hasOwnProperty(propertyName) &&
      propertyName !== "HIERARCHY" && // Deprecated HIERARCHY property
      propertyName !== "extensions" &&
      propertyName !== "extras"
    ) {
      properties[propertyName] = clone(jsonHeader[propertyName], true);
    }
  }

  return properties;
}
Size of the batch table, including the batch table hierarchy's binary
buffers and any binary properties. JSON data is not counted.

@memberof Cesium3DTileBatchTable.prototype
@type {number}
@readonly
@private