local PFIX_VER=$(installed_version $SPELL) &&
PFIX_VER=$(echo ${PFIX_VER:0:5} | sed -e 's/\.//g') &&

if [[ $PFIX_VER -lt 255 ]]; then
    persistent_add POSTFIX_EXP &&
    POSTFIX_EXP=$PFIX_EXP
fi &&

config_query POSTFIX_EXP "Build experimental version?" n