diff --git a/.github/codecov.yml b/.github/codecov.yml
new file mode 100644
index 0000000..ff4f571
--- /dev/null
+++ b/.github/codecov.yml
@@ -0,0 +1,21 @@
+# ref: https://docs.codecov.com/docs/codecovyml-reference
+coverage:
+  # Hold ourselves to a high bar
+  range: 85..100
+  round: down
+  precision: 1
+  status:
+    # ref: https://docs.codecov.com/docs/commit-status
+    project:
+      default:
+        # Avoid false negatives
+        threshold: 1%
+
+# Test files aren't important for coverage
+ignore:
+  - "tests"
+
+# Make comments less noisy
+comment:
+  layout: "files"
+  require_changes: yes
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..1557067
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: daily
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 0000000..406ba9b
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,88 @@
+permissions:
+  contents: read
+on:
+  push:
+    branches: [main]
+  pull_request:
+name: check
+jobs:
+  fmt:
+    runs-on: ubuntu-latest
+    name: stable / fmt
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: cargo fmt --check
+        run: cargo fmt --check
+  clippy:
+    runs-on: ubuntu-latest
+    name: ${{ matrix.toolchain }} / clippy
+    permissions:
+      contents: read
+      checks: write
+    strategy:
+      fail-fast: false
+      matrix:
+        toolchain: [stable, beta]
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          components: clippy
+      - name: cargo clippy
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+  doc:
+    runs-on: ubuntu-latest
+    name: nightly / doc
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install nightly
+        uses: dtolnay/rust-toolchain@nightly
+      - name: cargo doc
+        run: cargo doc --no-deps --all-features
+        env:
+          RUSTDOCFLAGS: --cfg docsrs
+  hack:
+    runs-on: ubuntu-latest
+    name: ubuntu / stable / features
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+      - name: cargo install cargo-hack
+        uses: taiki-e/install-action@cargo-hack
+      - name: cargo hack
+        run: cargo hack --feature-powerset check --lib --tests
+  msrv:
+    runs-on: ubuntu-latest
+    # we use a matrix here just because env can't be used in job names
+    # https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability
+    strategy:
+      matrix:
+        msrv: [1.56.1] # 2021 edition requires 1.56
+    name: ubuntu / ${{ matrix.msrv }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install ${{ matrix.msrv }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.msrv }}
+      - name: cargo +${{ matrix.msrv }} check
+        run: cargo check
diff --git a/.github/workflows/scheduled.yml b/.github/workflows/scheduled.yml
new file mode 100644
index 0000000..0215432
--- /dev/null
+++ b/.github/workflows/scheduled.yml
@@ -0,0 +1,48 @@
+permissions:
+  contents: read
+on:
+  push:
+    branches: [main]
+  pull_request:
+  schedule:
+    - cron:  '7 7 * * *'
+name: rolling
+jobs:
+  # https://twitter.com/mycoliza/status/1571295690063753218
+  nightly:
+    runs-on: ubuntu-latest
+    name: ubuntu / nightly
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install nightly
+        uses: dtolnay/rust-toolchain@nightly
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo test --locked
+        run: cargo test --locked --all-features --all-targets
+  # https://twitter.com/alcuadrado/status/1571291687837732873
+  update:
+    runs-on: ubuntu-latest
+    name: ubuntu / beta / updated
+    # There's no point running this if no Cargo.lock was checked in in the
+    # first place, since we'd just redo what happened in the regular test job.
+    # Unfortunately, hashFiles only works in if on steps, so we reepeat it.
+    # if: hashFiles('Cargo.lock') != ''
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install beta
+        if: hashFiles('Cargo.lock') != ''
+        uses: dtolnay/rust-toolchain@beta
+      - name: cargo update
+        if: hashFiles('Cargo.lock') != ''
+        run: cargo update
+      - name: cargo test
+        if: hashFiles('Cargo.lock') != ''
+        run: cargo test --locked --all-features --all-targets
+        env:
+          RUSTFLAGS: -D deprecated
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..8aa4488
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,85 @@
+permissions:
+  contents: read
+on:
+  push:
+    branches: [main]
+  pull_request:
+name: test
+jobs:
+  required:
+    runs-on: ubuntu-latest
+    name: ubuntu / ${{ matrix.toolchain }}
+    strategy:
+      matrix:
+        toolchain: [stable, beta]
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      # https://twitter.com/jonhoo/status/1571290371124260865
+      - name: cargo test --locked
+        run: cargo test --locked --all-features --all-targets
+  minimal:
+    runs-on: ubuntu-latest
+    name: ubuntu / stable / minimal-versions
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install nightly for -Zminimal-versions
+        uses: dtolnay/rust-toolchain@nightly
+      - name: rustup default stable
+        run: rustup default stable
+      - name: cargo update -Zminimal-versions
+        run: cargo +nightly update -Zminimal-versions
+      - name: cargo test
+        run: cargo test --locked --all-features --all-targets
+  os-check:
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} / stable
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo test
+        run: cargo test --locked --all-features --all-targets
+  coverage:
+    runs-on: ubuntu-latest
+    name: ubuntu / stable / coverage
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: llvm-tools-preview
+      - name: cargo install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo llvm-cov
+        run: cargo llvm-cov --locked --all-features --lcov --output-path lcov.info
+      - name: Upload to codecov.io
+        uses: codecov/codecov-action@v3
+        with:
+          fail_ci_if_error: true