// Remove the value in <ht> associated with <key_data>. Returns the value removed, or
// DOES_NOT_EXIST if there was no value for that key.
uint64_t ht_remove (hashtable_t *ht, const char *key_data, uint32_t key_len) {
// Remove the value in <ht> associated with <key_data>. Returns the value removed, or
// DOES_NOT_EXIST if there was no value for that key.
uint64_t ht_remove (hashtable_t *ht, const char *key_data, uint32_t key_len) {