Decode fails on POINT type (incompatibility with other PBF serializers)

By default, C# and Swift (and possibly other) Protobuf libraries do not encode first enum values. If the value is missing when decoded, those libraries assume the first enum value as default. The problem occurs when trying to pass PBFs encoded this way to decode.js. The readCoords function is checking for type, which if it's a POINT, is undefined. Obviously, this impacts anything expecting valid GeoJSON.

I dislike suggesting that something like this be used:

if (type === 'Point' || type === undefined ) geom.coordinates = readPoint(pbf);

It's sloppy because there might be other issues that caused an undefined condition. Perhaps a try-catch block to provisionally attempt to read coordinate data might be a solution. I just did a quick 'n' dirty test using:

else if (type === undefined) {

	try {
		geom.coordinates = readPoint(pbf);

		if (geom.coordinates.length !== 3) {
			throw "Invalid geometry for Point.";
		}

		geom.type = "MultiPolygon";

	} catch (err) {
			
	}
}

Start in decode.js at readCoords and readPoint, then inspect how POINT geometry type information is decoded. Determine how missing enum values from C# or Swift serializers can be distinguished from malformed geometry, and verify that valid POINT PBFs produce valid GeoJSON coordinates.