diondokter[m]: you can do that with

```rust
struct Db<F: NorFlash> { is_multiwrite: bool; flash: F }
fn new<F: NorFlash>(flash: F) -> Self { Self { flash, is_multiwrite: false } }
fn new_multiwrite<F: MultiwriteNorFlash>(flash: F) -> Self { Self { flash, is_multiwrite: true } }