[v2] Deprecate range

[theofidry]

As of now, the current regex (#\{([0-9]+)\.\.(\.?)([0-9]+)\}#i) allows both user{1..10} and user{1...10}. This makes it error prone which can be nice.

However, I think this can confuse the user as well (does it work well? Is it by design I as can't see anything in the doc about that?) and also if we support that I see no reason to not support user{0......10} for example.

Instead what about removing this behaviour in v3 and deprecating it in v2?

[tshelburne]

This makes sense to me.