#[builder(
    // For optional members automatically does `Option::as_ref` (reference
    // is moved under the Option).
    //
    // &T | Option<&T>
    getter,

    // For optional members does no conversion, because `&mut Option<_>` makes
    // sense if the caller wants to reset the `Option` to `None`.
    //
    // &mut T | &mut Option<T>
    getter(mut),

    // Deref is only supported for readonly getters. One probably doesn't
    // need deref for mutable getters, because returning e.g. `&mut String`
    // or `&mut Vec<T>` makes perfect sense.
    //
    // The argument to `deref` specifies the return type of the getter
    // (i.e. the target of the deref coercion). However, it can be omitted
    // (i.e. just `getter(deref)`) for some well-known types such as:
    // - String
    // - Vec<T>
    // - Box<T>
    // - Rc<T>
    // - Arc<T>
    // - Cow<T>
    // - PathBuf
    // - OsString
    // - CString
    // - Utf8PathBuf
    // - ...
    // Just look up the `Deref` impls in `std` here: https://doc.rust-lang.org/stable/std/ops/trait.Deref.html,
    // and in `camino` crate, we may extend this list in the future.
    //
    // &str | Option<&str>
    getter(deref(str)),

    // Useful for primitive types (e.g. `u32`)
    // Getter by `Copy` -> T | Option<T>
    getter(copy),

    // Getter by `Clone` -> T | Option<T>
    getter(clone),

    // Some other standard additional attributes
    getter(
        name = getter_name,
        vis = "",
        docs {
            /// Docs for getter_name
        }
    )

    // Multiple getters need to have name specified explicitly
    getter(name = getter_name_1),
    getter(name = getter_name_2, clone),

    // Custom readonly getter. Accepts a readonly reference and transforms it.
    // Only `&_` type is accepted (_ is replaced with member's type)
    getter = |value: &_| -> Ty { expr }

    // Custom mutable getter. Accepts a mutable reference and transforms it.
    // Only `&mut _` type is accepted (_ is replaced with member's type)
    getter = |value: &mut _| -> Ty { expr }

    // Give a name to the getter if there are several getters
    getter(name = foo, with = |value: &mut _| -> Ty { expr }),
)]