code: function isNumber( value ) {
  	return ( typeof value === 'number' || Object.prototype.toString.call( value ) === '[object Number]' ) && value.valueOf() === value.valueOf();
  }
docs: FUNCTION: isNumber( value )
  Validates if a value is a number.
  
  @param {*} value - value to be validated
  @returns {Boolean} boolean indicating whether value is a number