Duplicate GET parameters are lost

As described on

http://stackoverflow.com/questions/1746507/authoritative-position-of-duplicate-http-get-query-keys

there is no spec on whether duplicate http query parameters are allowed or not. One of the frameworks that allow use of multiple query parameter keys is Java EE:

http://docs.oracle.com/javaee/6/api/javax/servlet/ServletRequest.html#getParameterValues(java.lang.String)

and also PHP uses this extensively (see first link).

By saving query parameters in a Map<String, String> as Apiman does in ApiRequest, you loose the possibility to use multiple query parameters with the same key. With the current implementation only the last value for each key is saved.

I wanted to fix this (using e.g. Map<String, List<String>>) and doing a pull request, but... I'm afraid that changing ApiRequest is a big no-no, as it probably breaks (custom) policy plugins such as APIMAN-813.

However, fixing this issue now, in the early life of Apiman, is probably much better than trying to do this later...

Thoughts?