make sure BigInteger values are int or long

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Remove unnecessary casts

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Changed jitdriver to have one for float and one for int limits

- and correct debug output for merge points

Signed-off-by: Stefan Marr <git@stefan-marr.de>