Transparent polygon fill in stylesheet has no hit detection

[kjeszenka]

With the update to the polygon fill hit detection in openlayers/openlayers#7750, I cannot set a fill-color to have a 0 opacity or fill-opacity: 0 within a stylesheet and have any kind of hit detection within a polygon. When the styles are converted into a style function through this package, it treats a 0 opacity polygon fill instead as having no fill and so no hit is detected.