ycb_django_pr13128

what a new run launched now would send

make temporal subtraction work without ExpressionWrapper
Description
	
class Experiment(models.Model):
	start = models.DateTimeField()
	end = models.DateTimeField()
Experiment.objects.annotate(
	delta=F('end') - F('start') + Value(datetime.timedelta(), output_field=DurationField())
)
This gives:
django.core.exceptions.FieldError: Expression contains mixed types: DateTimeField, DurationField. You must set output_field.

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