fix: copy buffer view when iterating on file

[lowlighter]

Closes #8

As @lucacasonato debugged in denoland/deno#10467, scrambled response output on large files may occur because the buffer is not copied so its content may change between iterations

Unless it has changed, this module is used by deno deploy and thus causing problems on it when trying to load large local files (current workaround was to use raw.githubusercontent instead of fetching local files)

It requires the patch for - writable: true from #9 to work, I left it out to avoid conflicts with it 👍

[lowlighter]

Seems that Default size of the buffer is 32kB., but added text file only weight 3kb so test probably doesn't cover fix. Should I duplicate it 11 times more ?

[lucacasonato]

Yeah please - or just generate a file into /tmp during the test.

[lowlighter]

Let me know when #9 gets merged so I can rebase on it to make build successful 👍

[lucacasonato]

Merged :-)

[lowlighter]

Should work now 🙂

[lucacasonato]

LGTM. Thanks :-)

[lowlighter]

Thanks a lot!
It may need a new release so denoland/deployctl can be patched too

My memory is a bit fuzzy about whether it only impacted deployctl or deno deploy too but if the later also uses this polyfill it may also need to be updated

[lucacasonato]

released 0.2.0 now. Deno Deploy does not use this polyfill.