If you assign a float with more decimal places than a DecimalField field
supports to that field, the value may round differently than if you assign
the same value as a string. For example:
class Invoice(models.Model):
gross = models.DecimalField(max_digits=10, decimal_places=1)
invoice.gross = 2.15 # saves as 2.1
invoice.gross = '2.15' # saves as 2.2
The default behavior of decimal rounding is ROUND_HALF_EVEN (to nearest
with ties going to nearest even integer). There's a proposal to change this
to cast floats to string and then use ROUND_HALF_UP to match the value of
strings [0][1]. Do you have any concerns about this? Is it something we
should even care about?
[0] https://github.com/django/django/pull/6410
[1] https://code.djangoproject.com/ticket/26459
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