Signed word lengths and indexes

[bearophile]

Adam Ruppe:
> Huh, weird. Doesn't make too much of a difference in practice though,
> since it only changes the malloc line slightly.

Probably it can be fixed, but you have to be careful, because the padding isn't constant, it can change in size according to the CPU word size and the types of the data that come before TailArray :-)

Bye,
bearophile