I have a column defined as

class Balance(Base):
  ..
  amount  = Column(DECIMAL('16,8'), default=Decimal('0'))
  ..


o = db.query(Balance).get(1)


Everything goes fine ...

type(o.amount)     => 'Decimal'

but 

isinstance(o.amount, Decimal)   => False


Im porting from a noSql database and somewhere in the code i have a call to 
Decimal.quantize that check types using "isinstance"


Question: How do i pass the isinstance check with an instance of Column?



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