In obs_ctio0m9 in setArgDict the darkTime is set as follows.

    def setArgDict(self, md, argDict):

        """Fill an argument dict with arguments for makeVisitInfo and pop associated metadata

        """

        super(Ctio0m9MakeRawVisitInfo, self).setArgDict(md, argDict)

        argDict["darkTime"] = md.get("DARKTIME")

it is not clear whether this would be better put in obs_base. If it should be, then the change would be to, presumably inside a try block, put

argDict["darkTime"] = self.popFloat(md, "DARKTIME")

and if so, maybe try a bunch of other likely/useful keys as well.

If it decided that this is not appropriate, and that each obs_package should do this itself then this ticket should be marked as "Won't fix/invalid".