Feature request: Report capacity 0 instead of panick when alignment isn't satisfied

[juchiast]

Currently, it is not possible to use im to store i64, f64, etc. on architectures where usize alignment is less than 8, such as WASM and arm32 (bodil/im-rs#174).

I think InlineArray should report capacity 0 instead of panicking to support more architectures.

[kornelski]

You can use the backing storage type T to get bigger alignment, i.e. instead of storing i64 in [u8; 8], you can store it in [i64; 1].

[juchiast]

Thanks! I uses this indirectly through im, so I don't have much control to get around the issue.

[juchiast]

I could use #[repr(packed)] on my struct to reduce the alignment, but unfortunately it also needs #[derive(Deserialize)], and it is not possible to derive on packed and !Copy types at the moment.

[bodil]

Almost sounds to me like it's worth making the InlineArray itself align 8, to lessen the risk of misalignment.