code: public static ISchemaVersion getSchemaVersion(final byte[] bytes) {
          final byte versionByte = bytes[0];
          final int schemaVersionNumber = schemaVersion(versionByte);
  
          return getSchemaVersion(schemaVersionNumber);
      }
docs: Get the appropriate {@link ISchemaVersion schema version} for the specified
  serialized HLL.
  
  @param  bytes the serialized HLL whose schema version is desired.
  @return the schema version for the specified HLL. This will never
  be <code>null</code>.