docs: function decorateWithReadConcern(command, coll) {
    let readConcern = Object.assign({}, command.readConcern || {});
    if (coll.s.readConcern) {
      Object.assign(readConcern, coll.s.readConcern);
    }
  
    if (Object.keys(readConcern).length > 0) {
      Object.assign(command, { readConcern: readConcern });
    }
  }