{
  eliminate new/free mismatch warnings altogether, as something in the current toolchain generates this scenario.
  Memcheck:Free
  fun:free
  ...
}
{
   re2 cond-jump failure
   Memcheck:Cond
   fun:_ZNK3re210SparseSetTIvE8containsEi
   ...
}
{
   re2 uninit-value
   Memcheck:Value8
   fun:_ZNK3re210SparseSetTIvE8containsEi
   ...
}
{
   re2 cond-jump failure
   Memcheck:Cond
   fun:_ZNK3re211SparseArrayIiE9has_indexEi
   ...
}
{
   re2 uninit-value
   Memcheck:Value8
   fun:_ZNK3re211SparseArrayIiE9has_indexEi
   ...
}