nl_tokens: An object that contains ranges of time for various reasons .
pl_tokens: function rangeCheck ( fnName , index , maxIndex ) { if ( typeof <mask> !== 'number' || index < 0 || index > maxIndex ) { throw new Error ( 'Failed to execute \'' + fnName + '\' on \'TimeRanges\': The index provided (' + index + ') is non-numeric or out of bounds (0-' + maxIndex + ').' ) ; } }