DecimalField problem

[anonymous]

For a model field created as :: models.DecimalField(max_digits = 200, decimal_places = 100, blank = False, null = False)
While using admin interface to insert a record involving such a DecimalField, the format changes (loss of precision and it uses scientific notation (even in the database)) (Please note - it works properly for low precision values (example - .987654321001234) - but for larger precision values (probably 15 decimal_places or more) it results in loss of precision)

django version 1.3.1 and 1.4c1 (don't know about older versions);
python 2.6.6;
linux;