voltLib parser doesn't accept PROCESS MARKS NONE (and ALL seems broken too)

voltLib parser doesn't accept PROCESS MARKS NONE (and ALL seems broken too): a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm using fontTools.voltLib to parse a .vtp file exported from Microsoft VOLT. According to the VOLT syntax, the PROCESS MARKS directive…