Add basic lexenv support

src/hashtable.c

@@ -56,7 +56,7 @@ static uintptr_t hash_key_for_table(LispHashTable *ht, LispVal *key) {
 
 static bool compare_keys(LispHashTable *ht, LispVal *key1, LispVal *key2) {
     if (NILP(ht->eq_fn) || ht->eq_fn == Qeq) {
-        return key1 == key2;
+        return EQ(key1, key2);
     } else if (ht->eq_fn == Qstrings_equal) { // needed for initialization
         return !NILP(Fstrings_equal(key1, key2));
     }