Possible bug

Is this a possible bug in a feature of sharp, unrelated to installation?

• [ X] Running npm install sharp completes without error.
• [ X] Running node -e "require('sharp')" completes without error.

If you cannot confirm both of these, please open an installation issue instead.

Are you using the latest version of sharp?

• [ X] I am using the latest version of sharp as reported by npm view sharp dist-tags.latest.

If you cannot confirm this, please upgrade to the latest version and try again before opening an issue.

If you are using another package which depends on a version of sharp that is not the latest, please open an issue against that package instead.

What is the output of running npx envinfo --binaries --system --npmPackages=sharp --npmGlobalPackages=sharp?

System:
OS: macOS 10.15.7
CPU: (6) x64 Intel(R) Core(TM) i5-8500B CPU @ 3.00GHz
Memory: 16.41 MB / 16.00 GB
Shell: 5.7.1 - /bin/zsh
Binaries:
Node: 16.14.2 - ~/.nvm/versions/node/v16.14.2/bin/node
npm: 8.5.0 - ~/.nvm/versions/node/v16.14.2/bin/npm
npmPackages:
sharp: ^0.30.6 => 0.30.6

What are the steps to reproduce?

Setting WebP effort to 0 (fastest) in the constructor does not change the effort option to 0.

However, setting WebP effort 1 in the constructor correctly changes the effort option to 1.

https://sharp.pixelplumbing.com/api-output#webp

What is the expected behaviour?

The effort option should be set to 0.

Please provide a minimal, standalone code sample, without other dependencies, that demonstrates this problem

const image = sharp(input.gif, { animated: true }).webp({ quality: 100, effort: 0 })

image.toFile(output.webp, (err) => {
    console.log("WebP Effort ====>", image.options.webpEffort);
    if (err === null) {
      console.log("Success");
    } else {
      console.log("Error")
    }
  });

Please provide sample image(s) that help explain this problem

https://en.wikipedia.org/wiki/GIF#/media/File:Rotating_earth_(large).gif