border query parameter is parsed wrong? `static/auto/`

[HarelM]

I was playing with the ability to style a line using this library to create images for OSM recordings.
I'm using the static/auto/ endpoint.
Since I'm sending a large number of points I'm using the POST request which was recently added.
While playing with this the following didn't work for me:

1. When setting linecap or linejoin inside the body, these are ignored.
2. When sending the border color in the query parameters I'm getting an error about invalid color - note the extra "," in the error message, I'm guessing it's a parsing error of some sort.

Invalid border color: white,, skipping border
POST /styles/mapeak-hike/static/auto/128x128.jpg?border=white&linejoin=round&linecap=round&borderwidth=5

So I ended up using the following workaround (C# code):

        var queryParameters = $"styles/mapeak-hike/static/auto/{width}x{height}.jpg?linejoin=round&linecap=round";
        var allPointsString = string.Join("|", dataContainer.Routes.SelectMany(r => r.Segments.SelectMany(s => s.Latlngs)).Select(l => $"{l.Lng},{l.Lat}"));
        var body = new TileServerImageCreatorBody
        {
            Path = "stroke:blue|width:5|border:white|borderwidth:2|" + allPointsString,
        };

The combination above created the expected image.

As a side note, it might be better to have linejoin round as default for lines to prevent weird artifacts as can be seen here:

• Recordings image has "spikes" IsraelHikingMap/Site#2508