code: function findMeta(any, key) {
    key = key || 'cql';
    var meta = (any.describe().meta || []).filter(function (m) {
      return key in m;
    });
    return meta[meta.length - 1];
  }
docs: Find the meta object that has the key given.
  
  @param {Joi} any - the validator to be inspected
  @param {String} key - the name of the field in the meta object that we are looking for
  @returns {JoiMetaDefinition} - the result