mask: ${mask:192.168.10.206/0}
mask: ${mask:192.168.10.206}
mask: ${mask:a.b.c.d}
+mask: ${mask:2a00:2:3:4:5:6:7:8/79}
+mask: ${mask:2a00:2:3:4:5:6:7:8/128}
+mask: ${mask:2a00:2:3:4:5:6:7:8/129}
+mask_n: ${mask_n:2a00:2:3:4:5:6:7:8/79}
ipv6denorm: ${ipv6denorm:::1}
ipv6denorm: ${ipv6denorm:fe00::1}
ipv6denorm: ${ipv6denorm:192.168.0.1}
rc=$runrc
${if eq{1}{2}{${run{/non/exist}}}{1!=2}}
rc=$runrc
+${run,preexpand {DIR/aux-fixed/0002.runfile 0}}
+rc=$runrc
# PRVS