language: rustmatrix:  include:    # Stable    - rust: stable      script:        - cargo test --verbose        - cargo test --features impl_serde --verbose    # Stable no_std    - rust: stable      name: "no_std stable"      install:        - rustup target add thumbv6m-none-eabi      script:        - cargo build --target thumbv6m-none-eabi --verbose    # Beta    - rust: beta      script:        - cargo test --verbose        - cargo test --features impl_serde --verbose    # Nightly    - rust: nightly      script:        - cargo test --verbose        - cargo test --all-features --verbose    # Miri    - rust: nightly      name: "Miri"      script:        - ci/miri.shjobs:  allow_failures:    - rust: nightly  fast_finish: true