`mod`/`remainder`

[m-bock]

I came across this while trying to port this library to another language:

mkSeed

1. To me it looks like ensureBetween assumes mod behaves like remainder/%. If mod is used, the extra check in the if condition seems to be redundant.

2. Does it take min into account?

3. It seems to not include max in the range

As we know seedMax and seedMin are positve, maybe something simpler would work:
seedMin + (mod n (seedMax - seedMin))

(and this would still not include the seedMax, maybe define seedMax = lcgM instead)

lcgPerturb

it produces invalid seeds when a negative value is passed as a first argument. I think changing remainder/% to mod may fix this.

Hope this is helpful, don't have the time to provide more accurate test examples.