815282c broke open() filters.
815282c broke open() filters.

The tests caught this correctly.

JDeuce/webassets,0x1997/webassets,florianjacob/webassets,scorphus/webassets,aconrad/webassets,glorpen/webassets,glorpen/webassets,john2x/webassets,aconrad/webassets,scorphus/webassets,JDeuce/webassets,heynemann/webassets,wijerasa/webassets,wijerasa/webassets,0x1997/webassets,heynemann/webassets,florianjacob/webassets,glorpen/webassets,heynemann/webassets,john2x/webassets,aconrad/webassets