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Actually, most Forth systems are classic single-xt systems. And most educational materials on how to implement Forth explain the classic single-xt approach.Interesting enough - considering this "dual xt" idea, 4tH has *ALWAYS* been "dual xt". All compilation behavior is in the compiler and all execution behavior is in the interpreter. Note 4tH *only* contains primitives. The Forth layer is what you build with these primitives, since both the compilation behavior and execution behavior is coded in C.
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