A small question default values in tmplate-functions

[Uplink_Coder]

Hello,

Suppose I have the following function

auto veryStableAPI(string parameter,VaraiadicParams...)() {
     // do something very slow and stable;
  ....
}

auto experimentalReplacement(string parameter,VaraidcParams 
...)() {
  // do the same thing very fast and dangerous
}

is the following

auto veryStableAPI(bool brave=false, string 
parameter,VaraiadicParams...) {
  static if (!brave)
      // do something very slow and stable;
  else
      // do the same thing very fast and dangerous
}
valid according to spec ?