Template add filter

Hi, i am writing this because i wanted to decrement a
variable.
To increment, i used var|add:1
To decrement i tryed var|add:-1, but it gives this error:
TemplateSyntaxError at (...)
add requires 1 arguments, 0 provided

why not create a sub filter?
like var|sub:1

i thing that i am not the only one that needs to decrement a
variable
in templates.

thx for the time

Bruno Almeida


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