forms.DecimalField validation crashes on "INF"
|Reported by:||epandurski||Owned by:||nobody|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
The same is true for '-INF', 'INFINITY', 'inf' etc.
Exception is raised in DecimalField's clean() method trying to
obtain abs(), obviously it is assumed that infinite values
have been already filtered.