I have been messing around with annotations and it appears the fillAlpha does not effect the transparency. Am I using it correctly? Here is the annotation data that I am using in my map. No matter if I use 0 or 1 the fill is fully transparent. I am testing this with android.
fillAlpha is implemented as alpha on Android, for some reason. I'll open a more general issue to track parity between platforms with regards to annotations.
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Now tracking this in #380