num_div for two integers used to fall back to double when the
quotient wasn't exact. R7RS / python lumbda require exact-in →
exact-out for /. Fixed: the rational_normalize path was already
wired for the is_exact branch; the int/int branch now calls it
too instead of make_double.
(/ 67 7) → 67/7 (was 9.5714285714285712)
(/ 1 3) → 1/3 (was 0.33333…)
(/ 6 2) → 3 (exact stays integer)
(+ 1/3 1/6) → 1/2 (rational arithmetic propagates)
C native + C-WASM tier now match python lumbda on / between integers.
asm tier rationals remain pending — that needs bignums in asm first.
native c-test: 205/205 still passes.
russell@unturf.com
991ef661e3