How to release node:zlib resources

I have some testcases which use the

node:zlib

node:zlib

node:zlib

node:zlib polyfill and I'm having a bit of trouble getting the tests to pass. Here's a very basic example:

import { createDeflate } from 'node:zlib';
Deno.test('deflate teardown', async () => {
  const deflate = createDeflate();
  deflate.close();
  await new Promise(ok => setTimeout(ok, 1000));
});

import { createDeflate } from 'node:zlib';
Deno.test('deflate teardown', async () => {
  const deflate = createDeflate();
  deflate.close();
  await new Promise(ok => setTimeout(ok, 1000));
});

import { createDeflate } from 'node:zlib';
Deno.test('deflate teardown', async () => {
  const deflate = createDeflate();
  deflate.close();
  await new Promise(ok => setTimeout(ok, 1000));
});

import { createDeflate } from 'node:zlib';
Deno.test('deflate teardown', async () => {
  const deflate = createDeflate();
  deflate.close();
  await new Promise(ok => setTimeout(ok, 1000));
});

When I run this, Deno finds a leak:

error: Leaking resources:
  - A "zlib" resource (rid 3) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.

error: Leaking resources:
  - A "zlib" resource (rid 3) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.

error: Leaking resources:
  - A "zlib" resource (rid 3) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.

error: Leaking resources:
  - A "zlib" resource (rid 3) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.

Am I missing something, or is this an issue with the

node:zlib

node:zlib

node:zlib

node:zlib polyfill?

How to release node:zlib resources

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