message: fix off-by-one assertion
diff: @@ -141,7 +141,7 @@ struct PDQIterator {
  inline friend idx_t operator-(const PDQIterator &lhs, const PDQIterator &rhs) {
  D_ASSERT((*lhs - *rhs) % lhs.entry_size == 0);
  - D_ASSERT(*lhs - *rhs > 0);
  + D_ASSERT(*lhs - *rhs >= 0);
  return (*lhs - *rhs) / lhs.entry_size;
  }
  