message: make some debug assertions in RangeObjectMap be full assertions
diff: @@ -117,11 +117,11 @@ impl<T> RangeObjectMap<T> {
  self.v.insert(pos, Elem { range, data });
  // If we aren't the first element, then our start must be greater than the preivous element's end
  if pos > 0 {
  - debug_assert!(self.v[pos - 1].range.end() <= range.start);
  + assert!(self.v[pos - 1].range.end() <= range.start);
  }
  // If we aren't the last element, then our end must be smaller than next element's start
  if pos < self.v.len() - 1 {
  - debug_assert!(range.end() <= self.v[pos + 1].range.start);
  + assert!(range.end() <= self.v[pos + 1].range.start);
  }
  }
  