lib/utils/validator.js
function (level) {
    var lowerCaseLevel = level.toLowerCase();
    if (_.contains(LEVELS, lowerCaseLevel)) {
      return lowerCaseLevel;
    } else {
      return LEVEL_OFF;
    }
  }
function (level) {
    var lowerCaseLevel = level.toLowerCase();
    if (_.contains(LEVELS, lowerCaseLevel)) {
      return lowerCaseLevel;
    } else {
      return LEVEL_OFF;
    }
  }
function ( level ) { var lowerCaseLevel = level . toLowerCase ( ) ; if ( _ . contains ( LEVELS , lowerCaseLevel ) ) { return lowerCaseLevel ; } else { return LEVEL_OFF ; } }
If level returned by tracer is not in LEVELS object, treat it as 'off'.
If level returned by tracer is not in LEVELS object treat it as off .