Do not convert internal buffer from MaybeUninit<[V; N]> to [V; N]

[victoryaskevich]

I briefly looked at the code and it seems there is no reason to convert it.

Even more, it violates Rust's safety rules, because the memory is not initialized.

So make items to be MaybeUninit

[yegor256]

@VictorBulba what would be the effect of this change? Somehow performance will go up?

[victoryaskevich]

Performance will not change. But here you do .assume_init() on uninitialized elements, which violates assume_init safety requirements.

[yegor256]

@VictorBulba this is intentional. We indeed "assume" that the elements are "init" in the array. Moreover, if we keep MaybeUninit inside Stack, the complexity of the code increases (unless I miss something).