Regression: DecimalField values are no longer quantized before written to the DB

[Aaron Mader]

Steps to reproduce:

1. Create a new project using the mysql backend
2. Create this model:

   class Apple(models.Model):
       weight = models.DecimalField(max_digits=4, decimal_places=1)
   

3. Create an instance of this record with input outside of the quantization limits

   from decimal import Decimal
   Apple.objects.create(
       weight = Decimal("1.01"),
   )
   

4. Attempt to fetch the record by the (expected) adjusted value

   from decimal import Decimal
   Apple.objects.filter(
       weight = Decimal("1.0"),
   )
   

Specifically, this change in behaviour was introduced in django 5.2.0, with prior versions of django quantizing the input value (1.01) to an acceptable value (1.0) before writing the value to the database.
I believe that change was introduced in pull request: ​https://github.com/django/django/pull/18895