fixed an overflow error caused by choosing too small a type to store variables #4
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Here is, in my best belief, the solution to the overflow bug. Depending on the number of variables, d4v2 chooses an appropriate type to save RAM.
It loses one bit because d4v2 encodes variables in unsigned types but adds the sign by hand afterward. Hence, d4v2 needs to "upgrade" to the next bigger type earlier.
This should fix my recently opened issue