Fixed loaded dice

[Smartnor]

This random number generator was used in a way that made it twice as likely to roll the highest number for any given die as any other number for that die.

The code :crypto.rand_uniform(0, n+1) increases the range of the uniform random number generator one higher than intended. The range extends from 0 up to and including num_sides.

So, Enum.at(die, index - 1) would give the highest result if index was zero. It would also give the highest result if index was num_sides. This would make the highest result twice as likely as any other since all of the others are generated uniformly.

This would skew the mean of the dice rolls higher than the true mean, hence loading the dice.

[ghost]

This library ruined my video game.