Deno.File:read() block size limit?

[Mehuge]

const f = await Deno.open('data/65536BYTEFILE', { read: true });
const block = new Uint8Array(65536);
let len = await f.read(block);
console.log(len, block.byteLength);
len = await f.read(block);
console.log(len, block.byteLength);
f.close();

Outputs

16384 65536
16384 65536

Why doesn't f.read() use the entire 64k buffer?

Platform: Windows.

[bnoordhuis]

It's a limitation in Tokio, see #9256 and #10157. It's not clear yet how we'll address it but we're aware of the issue.