fix(File): respect typed array byteOffset and byteLength

[mrbbot]

File ignored the byteOffset and byteLength properties of typed arrays, meaning the entire backing ArrayBuffer was included. Notably, this caused issues when passing Buffers to the File constructor.

import { File } from "undici";

const arrayBuffer = new TextEncoder().encode("abcdef").buffer;
const array = new Uint8Array(arrayBuffer, 1, 3);
const arrayFile = new File([array], "file.txt");
console.log(await arrayFile.text()); // expected "bcd", got "abcdef"

const buffer = Buffer.from("test");
const bufferFile = new File([buffer], "file.txt");
console.log(await bufferFile.text()); // expected "test", got garbage

[codecov-commenter]

Codecov Report

Merging #1601 (2f9d403) into main (ae6f554) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1601   +/-   ##
=======================================
  Coverage   95.21%   95.21%           
=======================================
  Files          50       50           
  Lines        4748     4748           
=======================================
  Hits         4521     4521           
  Misses        227      227           

Impacted Files	Coverage Δ
lib/fetch/file.js	92.85% <100.00%> (ø)

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[ronag]

Actually this is still wrong. We need to make a copy, not just a new reference. Could you fix that?

[ronag]

@KhafraDev is this something you could look into? The copy part.

[KhafraDev]

Will do. On vacation for the next 6 days but I'll see if I can get to it