static guint coherent_set_key_hash_by_key(gconstpointer key) {
  return wmem_strong_hash((const guint8 *)key, sizeof(coherent_set_key));
}
static guint coherent_set_key_hash_by_key(gconstpointer key) {
  return wmem_strong_hash((const guint8 *)key, sizeof(coherent_set_key));
}