chore: checkpoint before Python removal

vendor/ryu/benches/bench.rs

@@ -0,0 +1,42 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::fmt::Display;
+use std::hint;
+use std::io::Write;
+use std::{f32, f64};
+
+fn do_bench(c: &mut Criterion, group_name: &str, float: impl ryu::Float + Display) {
+    let mut group = c.benchmark_group(group_name);
+    group.bench_function("ryu", |b| {
+        let mut buf = ryu::Buffer::new();
+        b.iter(move || {
+            let float = hint::black_box(float);
+            let formatted = buf.format_finite(float);
+            hint::black_box(formatted);
+        });
+    });
+    group.bench_function("std::fmt", |b| {
+        let mut buf = Vec::with_capacity(20);
+        b.iter(|| {
+            buf.clear();
+            let float = hint::black_box(float);
+            write!(&mut buf, "{float}").unwrap();
+            hint::black_box(buf.as_slice());
+        });
+    });
+    group.finish();
+}
+
+fn bench(c: &mut Criterion) {
+    do_bench(c, "f64[0]", 0f64);
+    do_bench(c, "f64[short]", 0.1234f64);
+    do_bench(c, "f64[e]", f64::consts::E);
+    do_bench(c, "f64[max]", f64::MAX);
+
+    do_bench(c, "f32[0]", 0f32);
+    do_bench(c, "f32[short]", 0.1234f32);
+    do_bench(c, "f32[e]", f32::consts::E);
+    do_bench(c, "f32[max]", f32::MAX);
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);