message: Change rdcarray resize strategy to exponential instead of minimal
  * Normally this wasn't a problem but in a few cases we were doing lots
  of push_back calls and this caused horrible resize-by-1 behaviour.
  * So instead we double the available count (if that's larger than just
  satisfying the request).
diff: @@ -176,7 +176,11 @@ public:
  if(s <= capacity())
  return;
  - // for now, just resize exactly to what's needed.
  + // either double, or allocate what's needed, whichever is bigger. ie. by default we double in
  + // size but we don't grow exponentially in 2^n to cover a single really large resize
  + if(size_t(allocatedCount) * 2 > s)
  + s = size_t(allocatedCount) * 2;
  +
  T *newElems = allocate(null_terminator<T>::allocCount(s));
  // copy the elements to new storage
  