I notice that the pydal Expression class defines magic methods for most math operations, letting you create expression queries like `.select(db.Table.field*2)`. However, it doesn't define a __pow__ method, so I can't do something like `.select(db.Table.field**2)` to get a computed result that is the square of some field. Is there a reason for this? I'd like to be able to make such queries.
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