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Collision groups as previously coded were unusable due to Lua 5.1's lack of support for bitwise operators. This fixes that deficiency in two ways: 1) Objects now have the functions `addToCollisionGroup` and `removeFromCollisionGroup` 2) An `evaluateNumericSEXP` function has been added for returning SEXP results as numbers (so that the bitwise SEXP operators can be used)