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Can't set timezone-naive datetimes

13

**Describe the bug** Can't set timezone-naive datetimes **To Reproduce** 1. Model with two `DatetimeField`s and type `sqlalchemy.DateTime(timezone=False)` 2. Save timezone-naive datetime to first field (All ok) 3. Save timezone-naive datetime...

`UnicodeEncodeError: 'latin-1' codec can't encode characters on Russian text

1

  `UnicodeEncodeError: 'latin-1' codec can't encode characters in position xx-yy: ordinal not in range(256)` example of Russian text: `сижу на энергетиках, плотно`