Replace `strict` feature with serde_ignored
This crate basically gets us the same thing, but controlled by the calling code, not the crate itself: https://docs.rs/serde_ignored/0.1.0/serde_ignored/
This crate basically gets us the same thing, but controlled by the calling code, not the crate itself: https://docs.rs/serde_ignored/0.1.0/serde_ignored/