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625bd39050
This PR makes more optimizations to headers iterable by removing
`ObjectEntries` which was consistently prominent in the flame graph when
benchmarking an express server.
**this PR**
```
cpu: 13th Gen Intel(R) Core(TM) i9-13900H
runtime: deno 1.36.1 (x86_64-unknown-linux-gnu)
benchmark time (avg) iter/s (min … max) p75 p99 p995
------------------------------------------------------------------ -----------------------------
headers iter 9.6 µs/iter 104,134.1 (8.74 µs … 131.31 µs) 9.47 µs 12.61 µs 17.81 µs
```
**main**
```
cpu: 13th Gen Intel(R) Core(TM) i9-13900H
runtime: deno 1.36.1 (x86_64-unknown-linux-gnu)
benchmark time (avg) iter/s (min … max) p75 p99 p995
------------------------------------------------------------------ -----------------------------
headers iter 12.87 µs/iter 77,675.9 (11.97 µs … 132.34 µs) 12.76 µs 16.49 µs 26.4 µs
```
```js
const headers = new Headers({
"Content-Type": "application/json",
"X-Content-Type": "application/json",
"Date": "Thu, 14 Aug 2023 17:45:10 GMT",
"X-Deno": "Deno",
"Powered-By": "Deno",
"Content-Encoding": "gzip",
"Set-Cookie": "__Secure-ID=123; Secure; Domain=example.com",
"Content-Length": "150",
"Vary": "Accept-Encoding, Accept, X-Requested-With",
});
Deno.bench('headers iter', () => {
[...headers]
})
```
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|---|---|---|
| .. | ||
| broadcast_channel | ||
| cache | ||
| console | ||
| crypto | ||
| fetch | ||
| ffi | ||
| fs | ||
| http | ||
| io | ||
| kv | ||
| napi | ||
| net | ||
| node | ||
| tls | ||
| url | ||
| web | ||
| webidl | ||
| websocket | ||
| webstorage | ||