vendor/zerovec/benches/zeromap.rs - toolchain/rustc - Git at Google

 // This file is part of ICU4X. For terms of use, please see the file
 // called LICENSE at the top level of the ICU4X source tree
 // (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

 use std::{collections::HashMap, fs};

 use criterion::{black_box, criterion_group, criterion_main, Criterion};

 use zerovec::maps::ZeroMapKV;
 use zerovec::vecs::{Index32, VarZeroSlice, VarZeroVec};
 use zerovec::ZeroMap;

 const DATA: [(&str, &str); 16] = [
     ("ar", "Arabic"),
     ("bn", "Bangla"),
     ("ccp", "Chakma"),
     ("chr", "Cherokee"),
     ("el", "Greek"),
     ("en", "English"),
     ("eo", "Esperanto"),
     ("es", "Spanish"),
     ("fr", "French"),
     ("iu", "Inuktitut"),
     ("ja", "Japanese"),
     ("ru", "Russian"),
     ("sr", "Serbian"),
     ("th", "Thai"),
     ("tr", "Turkish"),
     ("zh", "Chinese"),
 ];

 const POSTCARD: [u8; 282] = [
     102, 16, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 4, 0, 0, 0, 7, 0, 0, 0, 10, 0, 0, 0, 12, 0, 0, 0, 14,
     0, 0, 0, 16, 0, 0, 0, 18, 0, 0, 0, 20, 0, 0, 0, 22, 0, 0, 0, 24, 0, 0, 0, 26, 0, 0, 0, 28, 0,
     0, 0, 30, 0, 0, 0, 32, 0, 0, 0, 97, 114, 98, 110, 99, 99, 112, 99, 104, 114, 101, 108, 101,
     110, 101, 111, 101, 115, 102, 114, 105, 117, 106, 97, 114, 117, 115, 114, 116, 104, 116, 114,
     122, 104, 177, 1, 16, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 12, 0, 0, 0, 18, 0, 0, 0, 26, 0, 0, 0,
     31, 0, 0, 0, 38, 0, 0, 0, 47, 0, 0, 0, 54, 0, 0, 0, 60, 0, 0, 0, 69, 0, 0, 0, 77, 0, 0, 0, 84,
     0, 0, 0, 91, 0, 0, 0, 95, 0, 0, 0, 102, 0, 0, 0, 65, 114, 97, 98, 105, 99, 66, 97, 110, 103,
     108, 97, 67, 104, 97, 107, 109, 97, 67, 104, 101, 114, 111, 107, 101, 101, 71, 114, 101, 101,
     107, 69, 110, 103, 108, 105, 115, 104, 69, 115, 112, 101, 114, 97, 110, 116, 111, 83, 112, 97,
     110, 105, 115, 104, 70, 114, 101, 110, 99, 104, 73, 110, 117, 107, 116, 105, 116, 117, 116, 74,
     97, 112, 97, 110, 101, 115, 101, 82, 117, 115, 115, 105, 97, 110, 83, 101, 114, 98, 105, 97,
     110, 84, 104, 97, 105, 84, 117, 114, 107, 105, 115, 104, 67, 104, 105, 110, 101, 115, 101,
 ];

 const POSTCARD_HASHMAP: [u8; 176] = [
     16, 2, 114, 117, 7, 82, 117, 115, 115, 105, 97, 110, 3, 99, 99, 112, 6, 67, 104, 97, 107, 109,
     97, 3, 99, 104, 114, 8, 67, 104, 101, 114, 111, 107, 101, 101, 2, 116, 114, 7, 84, 117, 114,
     107, 105, 115, 104, 2, 116, 104, 4, 84, 104, 97, 105, 2, 106, 97, 8, 74, 97, 112, 97, 110, 101,
     115, 101, 2, 101, 115, 7, 83, 112, 97, 110, 105, 115, 104, 2, 101, 111, 9, 69, 115, 112, 101,
     114, 97, 110, 116, 111, 2, 122, 104, 7, 67, 104, 105, 110, 101, 115, 101, 2, 115, 114, 7, 83,
     101, 114, 98, 105, 97, 110, 2, 101, 110, 7, 69, 110, 103, 108, 105, 115, 104, 2, 105, 117, 9,
     73, 110, 117, 107, 116, 105, 116, 117, 116, 2, 102, 114, 6, 70, 114, 101, 110, 99, 104, 2, 98,
     110, 6, 66, 97, 110, 103, 108, 97, 2, 101, 108, 5, 71, 114, 101, 101, 107, 2, 97, 114, 6, 65,
     114, 97, 98, 105, 99,
 ];

 /// Run this function to print new data to the console.
 /// Requires the optional `serde` Cargo feature.
 #[allow(dead_code)]
 fn generate() {
     let map = build_zeromap(false);
     let buf = postcard::to_stdvec(&map).unwrap();
     println!("{:?}", buf);
 }

 /// Run this function to print new data to the console.
 /// Requires the optional `serde` Cargo feature.
 #[allow(dead_code)]
 fn generate_hashmap() {
     let map = build_hashmap(false);
     let buf = postcard::to_stdvec(&map).unwrap();
     println!("{:?}", buf);
 }

 #[cfg(feature = "generate")]
 fn generate_test_data() {
     let zeromap = build_zeromap(true);
     let zeromap_bytes = postcard::to_stdvec(&zeromap).unwrap();
     fs::write("large_zeromap.postcard", &zeromap_bytes).unwrap();

     let hashmap = build_hashmap(true);
     let hashmap_bytes = postcard::to_stdvec(&hashmap).unwrap();
     fs::write("large_hashmap.postcard", &hashmap_bytes).unwrap();
 }

 fn overview_bench(c: &mut Criterion) {
     // Uncomment the following line to re-generate the binary data.
     // generate();

     bench_deserialize(c);
     bench_deserialize_large(c);
     bench_lookup(c);
     bench_lookup_large(c);

     bench_hashmap(c);

     #[cfg(feature = "generate")]
     generate_test_data();
 }

 fn build_zeromap(large: bool) -> ZeroMap<'static, Index32Str, Index32Str> {
     let mut map: ZeroMap<Index32Str, Index32Str> = ZeroMap::new();
     for (key, value) in DATA.iter() {
         if large {
             for n in 0..8192 {
                 map.insert(indexify(&format!("{}{}", key, n)), indexify(value));
             }
         } else {
             map.insert(indexify(key), indexify(value));
         }
     }
     map
 }

 fn bench_deserialize(c: &mut Criterion) {
     c.bench_function("zeromap/deserialize/small", |b| {
         b.iter(|| {
             let map: ZeroMap<Index32Str, Index32Str> =
                 postcard::from_bytes(black_box(&POSTCARD)).unwrap();
             assert_eq!(map.get(indexify("iu")).map(|x| &x.0), Some("Inuktitut"));
         })
     });
 }

 fn bench_deserialize_large(c: &mut Criterion) {
     let buf = read_large_zeromap_postcard_bytes();
     c.bench_function("zeromap/deserialize/large", |b| {
         b.iter(|| {
             let map: ZeroMap<Index32Str, Index32Str> =
                 postcard::from_bytes(black_box(&buf)).unwrap();
             assert_eq!(map.get(indexify("iu3333")).map(|x| &x.0), Some("Inuktitut"));
         })
     });
 }

 fn bench_lookup(c: &mut Criterion) {
     let map: ZeroMap<Index32Str, Index32Str> = postcard::from_bytes(black_box(&POSTCARD)).unwrap();
     c.bench_function("zeromap/lookup/small", |b| {
         b.iter(|| {
             assert_eq!(
                 map.get(black_box(indexify("iu"))).map(|x| &x.0),
                 Some("Inuktitut")
             );
             assert_eq!(map.get(black_box(indexify("zz"))).map(|x| &x.0), None);
         });
     });
 }

 fn bench_lookup_large(c: &mut Criterion) {
     let buf = read_large_zeromap_postcard_bytes();
     let map: ZeroMap<Index32Str, Index32Str> = postcard::from_bytes(&buf).unwrap();
     c.bench_function("zeromap/lookup/large", |b| {
         b.iter(|| {
             assert_eq!(
                 map.get(black_box(indexify("iu3333"))).map(|x| &x.0),
                 Some("Inuktitut")
             );
             assert_eq!(map.get(black_box(indexify("zz"))).map(|x| &x.0), None);
         });
     });
 }

 fn read_large_zeromap_postcard_bytes() -> Vec<u8> {
     let path = concat!(
         env!("CARGO_MANIFEST_DIR"),
         "/benches/testdata/large_zeromap.postcard"
     );
     fs::read(path).unwrap()
 }

 fn bench_hashmap(c: &mut Criterion) {
     // Uncomment the following line to re-generate the binary data.
     // generate_hashmap();

     bench_deserialize_hashmap(c);
     bench_deserialize_large_hashmap(c);
     bench_lookup_hashmap(c);
     bench_lookup_large_hashmap(c);
 }

 fn build_hashmap(large: bool) -> HashMap<String, String> {
     let mut map: HashMap<String, String> = HashMap::new();
     for &(key, value) in DATA.iter() {
         if large {
             for n in 0..8192 {
                 map.insert(format!("{}{}", key, n), value.to_owned());
             }
         } else {
             map.insert(key.to_owned(), value.to_owned());
         }
     }
     map
 }

 fn bench_deserialize_hashmap(c: &mut Criterion) {
     c.bench_function("zeromap/deserialize/small/hashmap", |b| {
         b.iter(|| {
             let map: HashMap<String, String> =
                 postcard::from_bytes(black_box(&POSTCARD_HASHMAP)).unwrap();
             assert_eq!(map.get("iu"), Some(&"Inuktitut".to_owned()));
         })
     });
 }

 fn bench_deserialize_large_hashmap(c: &mut Criterion) {
     let buf = read_large_hashmap_postcard_bytes();
     c.bench_function("zeromap/deserialize/large/hashmap", |b| {
         b.iter(|| {
             let map: HashMap<String, String> = postcard::from_bytes(black_box(&buf)).unwrap();
             assert_eq!(map.get("iu3333"), Some(&"Inuktitut".to_owned()));
         })
     });
 }

 fn bench_lookup_hashmap(c: &mut Criterion) {
     let map: HashMap<String, String> = postcard::from_bytes(black_box(&POSTCARD_HASHMAP)).unwrap();
     c.bench_function("zeromap/lookup/small/hashmap", |b| {
         b.iter(|| {
             assert_eq!(map.get(black_box("iu")), Some(&"Inuktitut".to_owned()));
             assert_eq!(map.get(black_box("zz")), None);
         });
     });
 }

 fn bench_lookup_large_hashmap(c: &mut Criterion) {
     let buf = read_large_hashmap_postcard_bytes();
     let map: HashMap<String, String> = postcard::from_bytes(&buf).unwrap();
     c.bench_function("zeromap/lookup/large/hashmap", |b| {
         b.iter(|| {
             assert_eq!(map.get(black_box("iu3333")), Some(&"Inuktitut".to_owned()));
             assert_eq!(map.get(black_box("zz")), None);
         });
     });
 }

 fn read_large_hashmap_postcard_bytes() -> Vec<u8> {
     let path = concat!(
         env!("CARGO_MANIFEST_DIR"),
         "/benches/testdata/large_hashmap.postcard"
     );
     fs::read(path).unwrap()
 }

 criterion_group!(benches, overview_bench);
 criterion_main!(benches);

 /// This type lets us use a u32-index-format VarZeroVec with the ZeroMap.
 ///
 /// Eventually we will have a FormatSelector type that lets us do `ZeroMap<FormatSelector<K, Index32>, V>`
 /// (https://github.com/unicode-org/icu4x/issues/2312)
 ///
 /// ,  isn't actually important; it's just more convenient to use make_varule to get the
 /// full suite of traits instead of `#[derive(VarULE)]`. (With `#[derive(VarULE)]` we would have to manually
 /// define a Serialize implementation, and that would be gnarly)
 /// https://github.com/unicode-org/icu4x/issues/2310 tracks being able to do this with derive(ULE)
 #[zerovec::make_varule(Index32Str)]
 #[zerovec::skip_derive(ZeroMapKV)]
 #[derive(Eq, PartialEq, Ord, PartialOrd, serde::Serialize, serde::Deserialize)]
 #[zerovec::derive(Serialize, Deserialize)]
 pub(crate) struct Index32StrBorrowed<'a>(#[serde(borrow)] pub &'a str);

 impl<'a> ZeroMapKV<'a> for Index32Str {
     type Container = VarZeroVec<'a, Index32Str, Index32>;
     type Slice = VarZeroSlice<Index32Str, Index32>;
     type GetType = Index32Str;
     type OwnedType = Box<Index32Str>;
 }

 #[inline]
 fn indexify(s: &str) -> &Index32Str {
     unsafe { ::core::mem::transmute(s) }
 }
	// This file is part of ICU4X. For terms of use, please see the file
	// called LICENSE at the top level of the ICU4X source tree
	// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

	use std::{collections::HashMap, fs};

	use criterion::{black_box, criterion_group, criterion_main, Criterion};

	use zerovec::maps::ZeroMapKV;
	use zerovec::vecs::{Index32, VarZeroSlice, VarZeroVec};
	use zerovec::ZeroMap;

	const DATA: [(&str, &str); 16] = [
	("ar", "Arabic"),
	("bn", "Bangla"),
	("ccp", "Chakma"),
	("chr", "Cherokee"),
	("el", "Greek"),
	("en", "English"),
	("eo", "Esperanto"),
	("es", "Spanish"),
	("fr", "French"),
	("iu", "Inuktitut"),
	("ja", "Japanese"),
	("ru", "Russian"),
	("sr", "Serbian"),
	("th", "Thai"),
	("tr", "Turkish"),
	("zh", "Chinese"),
	];

	const POSTCARD: [u8; 282] = [
	102, 16, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 4, 0, 0, 0, 7, 0, 0, 0, 10, 0, 0, 0, 12, 0, 0, 0, 14,
	0, 0, 0, 16, 0, 0, 0, 18, 0, 0, 0, 20, 0, 0, 0, 22, 0, 0, 0, 24, 0, 0, 0, 26, 0, 0, 0, 28, 0,
	0, 0, 30, 0, 0, 0, 32, 0, 0, 0, 97, 114, 98, 110, 99, 99, 112, 99, 104, 114, 101, 108, 101,
	110, 101, 111, 101, 115, 102, 114, 105, 117, 106, 97, 114, 117, 115, 114, 116, 104, 116, 114,
	122, 104, 177, 1, 16, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 12, 0, 0, 0, 18, 0, 0, 0, 26, 0, 0, 0,
	31, 0, 0, 0, 38, 0, 0, 0, 47, 0, 0, 0, 54, 0, 0, 0, 60, 0, 0, 0, 69, 0, 0, 0, 77, 0, 0, 0, 84,
	0, 0, 0, 91, 0, 0, 0, 95, 0, 0, 0, 102, 0, 0, 0, 65, 114, 97, 98, 105, 99, 66, 97, 110, 103,
	108, 97, 67, 104, 97, 107, 109, 97, 67, 104, 101, 114, 111, 107, 101, 101, 71, 114, 101, 101,
	107, 69, 110, 103, 108, 105, 115, 104, 69, 115, 112, 101, 114, 97, 110, 116, 111, 83, 112, 97,
	110, 105, 115, 104, 70, 114, 101, 110, 99, 104, 73, 110, 117, 107, 116, 105, 116, 117, 116, 74,
	97, 112, 97, 110, 101, 115, 101, 82, 117, 115, 115, 105, 97, 110, 83, 101, 114, 98, 105, 97,
	110, 84, 104, 97, 105, 84, 117, 114, 107, 105, 115, 104, 67, 104, 105, 110, 101, 115, 101,
	];

	const POSTCARD_HASHMAP: [u8; 176] = [
	16, 2, 114, 117, 7, 82, 117, 115, 115, 105, 97, 110, 3, 99, 99, 112, 6, 67, 104, 97, 107, 109,
	97, 3, 99, 104, 114, 8, 67, 104, 101, 114, 111, 107, 101, 101, 2, 116, 114, 7, 84, 117, 114,
	107, 105, 115, 104, 2, 116, 104, 4, 84, 104, 97, 105, 2, 106, 97, 8, 74, 97, 112, 97, 110, 101,
	115, 101, 2, 101, 115, 7, 83, 112, 97, 110, 105, 115, 104, 2, 101, 111, 9, 69, 115, 112, 101,
	114, 97, 110, 116, 111, 2, 122, 104, 7, 67, 104, 105, 110, 101, 115, 101, 2, 115, 114, 7, 83,
	101, 114, 98, 105, 97, 110, 2, 101, 110, 7, 69, 110, 103, 108, 105, 115, 104, 2, 105, 117, 9,
	73, 110, 117, 107, 116, 105, 116, 117, 116, 2, 102, 114, 6, 70, 114, 101, 110, 99, 104, 2, 98,
	110, 6, 66, 97, 110, 103, 108, 97, 2, 101, 108, 5, 71, 114, 101, 101, 107, 2, 97, 114, 6, 65,
	114, 97, 98, 105, 99,
	];

	/// Run this function to print new data to the console.
	/// Requires the optional `serde` Cargo feature.
	#[allow(dead_code)]
	fn generate() {
	let map = build_zeromap(false);
	let buf = postcard::to_stdvec(&map).unwrap();
	println!("{:?}", buf);
	}

	/// Run this function to print new data to the console.
	/// Requires the optional `serde` Cargo feature.
	#[allow(dead_code)]
	fn generate_hashmap() {
	let map = build_hashmap(false);
	let buf = postcard::to_stdvec(&map).unwrap();
	println!("{:?}", buf);
	}

	#[cfg(feature = "generate")]
	fn generate_test_data() {
	let zeromap = build_zeromap(true);
	let zeromap_bytes = postcard::to_stdvec(&zeromap).unwrap();
	fs::write("large_zeromap.postcard", &zeromap_bytes).unwrap();

	let hashmap = build_hashmap(true);
	let hashmap_bytes = postcard::to_stdvec(&hashmap).unwrap();
	fs::write("large_hashmap.postcard", &hashmap_bytes).unwrap();
	}

	fn overview_bench(c: &mut Criterion) {
	// Uncomment the following line to re-generate the binary data.
	// generate();

	bench_deserialize(c);
	bench_deserialize_large(c);
	bench_lookup(c);
	bench_lookup_large(c);

	bench_hashmap(c);

	#[cfg(feature = "generate")]
	generate_test_data();
	}

	fn build_zeromap(large: bool) -> ZeroMap<'static, Index32Str, Index32Str> {
	let mut map: ZeroMap<Index32Str, Index32Str> = ZeroMap::new();
	for (key, value) in DATA.iter() {
	if large {
	for n in 0..8192 {
	map.insert(indexify(&format!("{}{}", key, n)), indexify(value));
	}
	} else {
	map.insert(indexify(key), indexify(value));
	}
	}
	map
	}

	fn bench_deserialize(c: &mut Criterion) {
	c.bench_function("zeromap/deserialize/small", \|b\| {
	b.iter(\|\| {
	let map: ZeroMap<Index32Str, Index32Str> =
	postcard::from_bytes(black_box(&POSTCARD)).unwrap();
	assert_eq!(map.get(indexify("iu")).map(\|x\| &x.0), Some("Inuktitut"));
	})
	});
	}

	fn bench_deserialize_large(c: &mut Criterion) {
	let buf = read_large_zeromap_postcard_bytes();
	c.bench_function("zeromap/deserialize/large", \|b\| {
	b.iter(\|\| {
	let map: ZeroMap<Index32Str, Index32Str> =
	postcard::from_bytes(black_box(&buf)).unwrap();
	assert_eq!(map.get(indexify("iu3333")).map(\|x\| &x.0), Some("Inuktitut"));
	})
	});
	}

	fn bench_lookup(c: &mut Criterion) {
	let map: ZeroMap<Index32Str, Index32Str> = postcard::from_bytes(black_box(&POSTCARD)).unwrap();
	c.bench_function("zeromap/lookup/small", \|b\| {
	b.iter(\|\| {
	assert_eq!(
	map.get(black_box(indexify("iu"))).map(\|x\| &x.0),
	Some("Inuktitut")
	);
	assert_eq!(map.get(black_box(indexify("zz"))).map(\|x\| &x.0), None);
	});
	});
	}

	fn bench_lookup_large(c: &mut Criterion) {
	let buf = read_large_zeromap_postcard_bytes();
	let map: ZeroMap<Index32Str, Index32Str> = postcard::from_bytes(&buf).unwrap();
	c.bench_function("zeromap/lookup/large", \|b\| {
	b.iter(\|\| {
	assert_eq!(
	map.get(black_box(indexify("iu3333"))).map(\|x\| &x.0),
	Some("Inuktitut")
	);
	assert_eq!(map.get(black_box(indexify("zz"))).map(\|x\| &x.0), None);
	});
	});
	}

	fn read_large_zeromap_postcard_bytes() -> Vec<u8> {
	let path = concat!(
	env!("CARGO_MANIFEST_DIR"),
	"/benches/testdata/large_zeromap.postcard"
	);
	fs::read(path).unwrap()
	}

	fn bench_hashmap(c: &mut Criterion) {
	// Uncomment the following line to re-generate the binary data.
	// generate_hashmap();

	bench_deserialize_hashmap(c);
	bench_deserialize_large_hashmap(c);
	bench_lookup_hashmap(c);
	bench_lookup_large_hashmap(c);
	}

	fn build_hashmap(large: bool) -> HashMap<String, String> {
	let mut map: HashMap<String, String> = HashMap::new();
	for &(key, value) in DATA.iter() {
	if large {
	for n in 0..8192 {
	map.insert(format!("{}{}", key, n), value.to_owned());
	}
	} else {
	map.insert(key.to_owned(), value.to_owned());
	}
	}
	map
	}

	fn bench_deserialize_hashmap(c: &mut Criterion) {
	c.bench_function("zeromap/deserialize/small/hashmap", \|b\| {
	b.iter(\|\| {
	let map: HashMap<String, String> =
	postcard::from_bytes(black_box(&POSTCARD_HASHMAP)).unwrap();
	assert_eq!(map.get("iu"), Some(&"Inuktitut".to_owned()));
	})
	});
	}

	fn bench_deserialize_large_hashmap(c: &mut Criterion) {
	let buf = read_large_hashmap_postcard_bytes();
	c.bench_function("zeromap/deserialize/large/hashmap", \|b\| {
	b.iter(\|\| {
	let map: HashMap<String, String> = postcard::from_bytes(black_box(&buf)).unwrap();
	assert_eq!(map.get("iu3333"), Some(&"Inuktitut".to_owned()));
	})
	});
	}

	fn bench_lookup_hashmap(c: &mut Criterion) {
	let map: HashMap<String, String> = postcard::from_bytes(black_box(&POSTCARD_HASHMAP)).unwrap();
	c.bench_function("zeromap/lookup/small/hashmap", \|b\| {
	b.iter(\|\| {
	assert_eq!(map.get(black_box("iu")), Some(&"Inuktitut".to_owned()));
	assert_eq!(map.get(black_box("zz")), None);
	});
	});
	}

	fn bench_lookup_large_hashmap(c: &mut Criterion) {
	let buf = read_large_hashmap_postcard_bytes();
	let map: HashMap<String, String> = postcard::from_bytes(&buf).unwrap();
	c.bench_function("zeromap/lookup/large/hashmap", \|b\| {
	b.iter(\|\| {
	assert_eq!(map.get(black_box("iu3333")), Some(&"Inuktitut".to_owned()));
	assert_eq!(map.get(black_box("zz")), None);
	});
	});
	}

	fn read_large_hashmap_postcard_bytes() -> Vec<u8> {
	let path = concat!(
	env!("CARGO_MANIFEST_DIR"),
	"/benches/testdata/large_hashmap.postcard"
	);
	fs::read(path).unwrap()
	}

	criterion_group!(benches, overview_bench);
	criterion_main!(benches);

	/// This type lets us use a u32-index-format VarZeroVec with the ZeroMap.
	///
	/// Eventually we will have a FormatSelector type that lets us do `ZeroMap<FormatSelector<K, Index32>, V>`
	/// (https://github.com/unicode-org/icu4x/issues/2312)
	///
	/// , isn't actually important; it's just more convenient to use make_varule to get the
	/// full suite of traits instead of `#[derive(VarULE)]`. (With `#[derive(VarULE)]` we would have to manually
	/// define a Serialize implementation, and that would be gnarly)
	/// https://github.com/unicode-org/icu4x/issues/2310 tracks being able to do this with derive(ULE)
	#[zerovec::make_varule(Index32Str)]
	#[zerovec::skip_derive(ZeroMapKV)]
	#[derive(Eq, PartialEq, Ord, PartialOrd, serde::Serialize, serde::Deserialize)]
	#[zerovec::derive(Serialize, Deserialize)]
	pub(crate) struct Index32StrBorrowed<'a>(#[serde(borrow)] pub &'a str);

	impl<'a> ZeroMapKV<'a> for Index32Str {
	type Container = VarZeroVec<'a, Index32Str, Index32>;
	type Slice = VarZeroSlice<Index32Str, Index32>;
	type GetType = Index32Str;
	type OwnedType = Box<Index32Str>;
	}

	#[inline]
	fn indexify(s: &str) -> &Index32Str {
	unsafe { ::core::mem::transmute(s) }
	}