feat: better builtins implementaion

get rid of circular references

src/lib.rs

@@ -1,11 +1,10 @@
 #![cfg_attr(test, feature(test))]
-
 #![allow(dead_code)]
 
 mod builtins;
 mod bytecode;
-mod ty;
 mod stack;
+mod ty;
 
 pub mod compile;
 pub mod error;