fix: should not serailize binary messages

[alexzhang1030]

🔗 Linked issue

closes #37

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• [x] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

[Vahelnir]

Hey, Not sure if you finished working on this PR yet, but I just wanted to let you know that, even though this PR looks necessary in order to fix #37, it doesn't fix it. You might not want to close the issue with this PR :/

It should be easy to "fix", so I might propose a PR once I know it should be fixed in crossws (I was waiting for the maintainers' feedback on my issue before doing any work).

Thanks for your work !