*Really* RTS crash due to bad coercion.
*Really* RTS crash due to bad coercion.

Previous commit only moved the coercion mistake to a different
architecture (i.e. underflow could still occur on platforms where Int
is smaller than CInt). This patch should definitively deal with all
possible combinations.

Signed-off-by: Austin Seipp <48c905ac3851f382b914247d97dd93273d5ff555@pobox.com>

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