Leaflet GeoJSON API proposal

geojson.js

var geojson = L.geoJson(data, {

	// style for all vector layers (color, opacity, etc.), either function or object (optional)
	style: function (feature) {
		return feature.properties && feature.properties.style;
	},
	
	// function for creating layers for GeoJSON point features (optional)
	pointToLayer: function (feature, latlng) {
		return L.marker(latlng, {
			icon: myCustomIcon,
			title: feature.properties && feature.properties.name
		});
	},
	
	// function that gets called on every created feature layer (optional)
	onEachFeature: function (feature, layer) {
		var content = feature.properties && feature.properties.popupContent;
		if (content) {
			layer.bindPopup(content);
		}
	},
	
	// function that decides whether to show a feature or not (optional)
	filter: function (feature, layer) {
		return !(feature.properties && feature.properties.isHidden);
	}
	
}).addTo(map);

// add more GeoJSON data
geojson.addData(moreData);

map.fitBounds(geojson.getBounds());

var marker, popupContent, properties;
            marker = e.layer;
            properties = marker.feature.properties;
            popupContent = '<div class="popup"><h3><a href="/places/' + properties.id + '" target="marker">' + properties.name + '</a></h3><p class="popup-num">' + properties.description + ' Point of Interest No. ' + properties.id + '</p></div>';

            return marker.bindPopup(popupContent, {
                closeButton: false,
                minWidth: 300
            }).addTo(map);

all goes on 'layeradd' event, hope I'm not too late.

Thanks for sharing this code this really help to solve my problem.