milter macro names

[Matthias Schneider]

Hi,

I just tried to upgrade our postfix instances from 2.11 to 3.1. This 
broke our milter that is expecting macro with name "i" but we got "{i}".
Could we make this configurable?
postfix 2.11:

.b...b.....rDRi.3vN6Xk4v7ZzDwHS.{rcpt_addr}.matthias.schneider@

postfix 3.1:
6ZH.6ZH....kDR{i}.3vN6VP5LlPz24hjY.{rcpt_addr}.matthias.schneider@


Thanks
Matthias Schneider