Negative integer number should be considered as "atom" in parsing,
so the prefix representation of INFROM "(^ - 1 (/ 1 2))" is OK, the problem
is inside unparse:
unparse x ==
atom?(s : % := unparseInputForm(x)$Lisp) => strsym s
concat [strsym a for a in destruct s]
unparseInputForm returns "(-1 ^ ( 1 / 2 ))" which is OK, the problem is
we shouldn't simply concat them together when change infix representation
to string. Do you agree?
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