Support conversion of &[T] and &str between languages

[w-utter]

Maybe this isn't the way to pass references across the ffi boundary, but say we have a rust defined struct which has been crossed over to dart, say List<RustType>, if we wanted to modify that type by taking a &mut [RustType] in rust. In Flutter, the corresponding type in the function declaration would be RustType which isn't completely correct.

Similarily, on the other side, if we wanted to return a &str from rust into flutter, we would have to clone the string in order to send it across the ffi boundary, since the trait SSeEncode is not implemented for &str.

Having to send owned variants across FFI is a way to bypass this, but I think that being able to pass references would be a much better option (aside from issues that may arise from lifetimes).

[welcome]

Hi! Thanks for opening your first issue here! 😄

[fzyzcjy]

Hi, have you tried the opaque feature? That one seems to be related.

[fzyzcjy]

Close since inactivity, but feel free to reopen!

[github-actions]

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