Tcl_HashEntry* entry = Tcl_FindHashEntry(hash.table, key);
Tcl_HashEntry* entry = Tcl_FindHashEntry(&hash->table, key);
const void* dp_hash_get_value(dp_hash_t h, const void* key) {    struct hashtable* hash = (struct hashtable*)h;    Tcl_HashEntry* entry = Tcl_FindHashEntry(hash.table, key);    if (entry != NULL) {        return (const void*)Tcl_GetHashValue(entry);    } else {        return NULL;    }}