add support for s-expressions and for WHERE limbs in DECIDE #404
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| x | IS | max of | foo |
| | | AND | bar |
it doesn't make sense to have a numeric result of > conjoined boolean-wise
> foo
bar
baz
AND < yo
ho
ho
so we should give a special case notion of a relationalpredicate to
allow specifically IS binding for implicit numeric types
DECIDE x IS > foo
bar
baz
and that in turn means we need to properly spell out a syntax for
mathematical expressions generally so we can do prefixed list
ops (rpnary) and infixed arithmetic
these are syntactic only, they have not been implemented semantically we do allow SUBJECT TO in the position of an RPnary operator
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this branch was intended to result in a prolog transpiler but we ended up doing a bunch of preparatory work related to the encoding first.