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Changes between Initial Version and Version 1 of Ticket #30548, comment 1

-              initial
+              v1
 Agreed, we can add types to this exception but I would like to keep it simple, e.g. "''Expression contains mixed types: FloatField, IntegerField. You must set output_field to IntegerField.''"
+{{{
+raise FieldError(
+    'Expression contains mixed types: %s, %s. You must set output_field to %s.'
+    % (output_field.__class__.__name__, source.__class__.__name__, source.__class__.__name__)
+)
+}}}