infinisil: if i use  lib.mkDefault , phpfpm just hangs on start. However redefining poolsettings with  poolSettings = {
    "pm" = "dynamic";
    "pm.max_children" = "2048";
    "pm.start_servers" = "2";
    "pm.min_spare_servers" = "2";
    "pm.max_spare_servers" = "4";
    "pm.max_requests" = "500";
    };

works ok???