[Jprogramming] in 15!:0 why pointer need boxing?

[bill lam]

In 15!:0 call, pointers need boxing,
   'lib foo n * *'&cd  (<123) ;< (<456)
why can't it just be
   'lib foo n * *'&cd  123 ; 456
I think that null pointer like,
   'lib foo n * *'&cd  123 ; 0
does not cause any ambiguity, because it is illegal to have a pointer for zero 
address in C language.

--
regards,
bill
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