code: function standardizeInput(input) {
    if ([undefined, null].indexOf(input) !== -1) {
      input = null;
    }
    else if (_.isNaN(input)) {
      input = null;
    }
    else if (_.isString(input)) {
      input = input.trim();
  
      // Written empty values
      if (["unspecified", "unknown", "none", "null", "empty", ""].indexOf(input.toLowerCase()) !== -1) {
        input = null;
      }
    }
  
    return input;
  }
docs: Standardize input, like handling empty