def meta_set(self, key, metafield, value):
        self._meta.setdefault(key, {})[metafield] = value
        if key in self:
            self[key] = self[key]
Set the meta field for a key to a new value. This triggers the
dataset/ETHPy150Open Arelle/Arelle/arelle/webserver/bottle.py/ConfigDict.meta_set