When creating Symbols the pathOptions argument is not shallow copied

[jules43]

If you create two Symbol instances like this:

options.stroke = true;
symbol1 = L.Symbol.arrowHead({pixelSize:10, headAngle: 60, pathOptions: options});
options.stroke = false
symbol2 = L.Symbol.arrowHead({pixelSize:10, headAngle: 60, pathOptions: options});

The first symbol will have it's stroke flag overwritten, so when the object refreshes (say on zoom), it will be created differently. This is due to the setOptions only doing a shallow copy.

To work around this I just change my call to:
symbol1 = L.Symbol.arrowHead({pixelSize:10, headAngle: 60, pathOptions: {...options}});