code: function(attrs, params) {
        params = params || {};
        var options = {};
        for(var key in attrs) {
          if (attrs[key] || attrs[key] === 0) {
            if (key.match(/^on[A-Z]/)) { //skip events, i.e. on-click
              continue;
            } else if (key.match(/ControlOptions$/)) { // skip controlOptions
              continue;
            } else {
              // nested conversions need to be typechecked
              // (non-strings are fully converted)
              if (typeof attrs[key] !== 'string') {
                options[key] = attrs[key];
              } else {
                if (params.doNotConverStringToNumber &&
                  attrs[key].match(/^[0-9]+$/)
                ) {
                  options[key] = attrs[key];
                } else {
                  options[key] = toOptionValue(attrs[key], {key: key, scope: params.scope});
                }
              }
            }
          } // if (attrs[key])
        } // for(var key in attrs)
        return options;
      }
docs: converts attributes hash to Google Maps API v3 options
  ```
  . converts numbers to number
  . converts class-like string to google maps instance
  i.e. `LatLng(1,1)` to `new google.maps.LatLng(1,1)`
  . converts constant-like string to google maps constant
  i.e. `MapTypeId.HYBRID` to `google.maps.MapTypeId.HYBRID`
  i.e. `HYBRID"` to `google.maps.MapTypeId.HYBRID`
  ```
  @memberof Attr2MapOptions
  @param {Hash} attrs tag attributes
  @param {Hash} options
  @returns {Hash} options converted attributess