We have a small discussion in our team how we should design our API around smallish non-trivial copy fields.

So lets say we have something like this:

#[derive(Copy)]
pub struct SmallishType {
     x: Duration,
     y: u32
}

pub struct Holder {
    z: SmallishType,
    ...
}

and we want now to implement a getter for Holder::z, should this getter return a reference or an owned value, i.e.

fn z(&self) -> &SmallishType { ... }

vs

fn z(&self) -> SmallishType { ... }

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