[Sqlalchemy-tickets] Issue #3655: BinaryExpression wrong type (datetime instead of date) (zzzeek/sqlalchemy)

[Tom K. <iss...@bi...>]

New issue 3655: BinaryExpression wrong type (datetime instead of date)
https://bitbucket.org/zzzeek/sqlalchemy/issues/3655/binaryexpression-wrong-type-datetime

Tom Kedem:

Suppose I have the following arrangement:
```
class MyModel(Base):
    date = Column(Date)

    @hybrid_property
    def offset_date(self):
        return self.date + datetime.timedelta(days=1)
```

The `offset_date` type is `datetime` instead of `date`. I would expect the result of the `BinaryExpression` to evaluate to the same type of the column. This is in accordance to how python evaluates the addition:
```
>>> type(datetime.date.today() + datetime.timedelta(days=1))
<class 'datetime.date'>
```

I'm using the latest master to date.