code: function isBoolean(value) {
        return value === true || value === false ||
          (isObjectLike(value) && baseGetTag(value) == boolTag);
      }
docs: Checks if `value` is classified as a boolean primitive or object.
  
  @static
  @memberOf _
  @since 0.1.0
  @category Lang
  @param {*} value The value to check.
  @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
  @example
  
  _.isBoolean(false);
  // => true
  
  _.isBoolean(null);
  // => false