docs, tests, benchmarks: improve trustworthiness and usability

.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+rustflags = ["-Ctarget-cpu=native"]

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: Swatinem/rust-cache@v2
       - name: Linux Tests
         run: |
-          cargo nextest run --profile ci --cargo-profile dev-ci --workspace
+          cargo nextest run --profile ci --cargo-profile dev-ci --workspace --features parallel
 
   lints:
     runs-on: ubuntu-latest
@@ -42,7 +42,7 @@ jobs:
       - name: Check *everything* compiles
         run: cargo check --all-targets --all-features --workspace
       - name: Check clippy lints
-        run: cargo clippy --workspace --all-targets -- -D warnings
+        run: cargo clippy --workspace --all-targets --all-features -- -D warnings
       - name: Doctests
         run: cargo test --doc --workspace
       - name: Get Rust version