Check for overflow reverts

[0xbok]

Any overflow or underflow revert can prevent a user from buying a clone. Check if that's the case.

[calvbore]

There are a good amount of overflow reverts. Do you think theses are likely to affect realistic amounts provided Ditto. And any ideas for what we could do to mitigate these?

[0xbok]

Haven't thought much about it yet. We'll need to think about deeply once code is frozen. Let's take a look whenever one of us get time.