add float number in template (django)

Maybe i'm missing something but i'm looking to add a float number, something like this:

{%floatnumber|add:3.4%}

Filter add roun开发者_StackOverflowd my result so I don't want to write my filter, but if is the only way, i'll copy add filter

Now i'm doing this:

def addf(value, arg):
    """Adds the arg to the value."""
    return float(value) + float(arg)
addf.is_safe = False
register.filter(addf)

Right now it turns it into int. There is an open ticket and I even sent a patch, but it haven't been commited yet ;-) Here is the ticket.