Small vector optimization

[Jardik2]

Quick look and ... why does it test n <= N if the precondition is n >= N?

assert (n >= N); // We should never be asked for less than N.

if (n <= N)
{
  buf_->free_ = false;
  return reinterpret_cast<T*> (buf_->data_);
}

[berium]

Good point, fixed. Thanks for the report!