docs: function(token) {
    if (token === undefined || token === null) {
      return {
        nextPartitionKey: undefined,
        nextRowKey:       undefined,
      };
    }
    assert(typeof token === 'string', 'Continuation token must be a string if ' +
                                       'not undefined');
    // Split at tilde (~)
    token = token.split('~');
    assert(token.length === 2, 'Expected an encoded continuation token with ' +
                               'a single tilde as separator');
    return {
      nextPartitionKey: decodeURIComponent(token[0]),
      nextRowKey:       decodeURIComponent(token[1]),
    };
  }