"first day" key in Balanced Loans contract does not have underscore

[bwhli]

Hi, I noticed this issue today. The position object in Balanced Loans contract has a space instead of underscore.

position = {
            'pos_id': pos_id,
            'created': self.created.get(),
            'address': str(self.address.get()),
            'snap_id': _id,
            'snaps_length': len(self.snaps),
            'last_snap': self.snaps[-1],
            'first day': self.snaps[0],
            'assets': assets,
            'total_debt': status['debt'],
            'collateral': status['collateral'],
            'ratio': status['ratio'],
            'standing': Standing.STANDINGS[status['standing']]
        }

Is this by design or a bug?