using `.getSchema()` on an existing table with the following definition: ``` @schema class ProbeAdjustment(dj.Manual): definition = """ -> ProbeInsertion adjustment_time: datetime --- -> [nullable] Session -> reference.Experimenter estimated_depth_change=null: float # (um) positive: moving more dorsal (shallower), negative: moving more ventral (deeper) adjustment : varchar(128) # new depth (ideally) """ ``` this error occurred: ``` Error using dj.internal.Declare.matchType (line 417) UnsupportedType: Attribute type ' moving more dorsal (shallower), negative' is not a valid type. ```