Fix Buffer converter matcher being mangled in minimised builds

[noway]

Fixes #164

• This fix might have performance implications - but it is passable for my use case.
• There are other converter matchers which might be mangled - but I only fixed Buffer since that fixes my use case

Happy to get this up to production quality/fix some other parts if i'm missing something.

[hildjj]

Does this work often enough to be worth it? isBuffer just uses instanceof, and if the two Buffer implementations are different, instanceof won't return true.

[hildjj]

I'd be wiling to add exports.Buffer = require('buffer').Buffer to cbor.js, which would allow everyone to use the same (already minified) Buffer implementation.

[noway]

Hi @hildjj, thank you for taking the time to review this and also maintaining the library!

isBuffer just uses instanceof, and if the two Buffer implementations are different, instanceof won't return true.

I'm not sure I fully get this argument, I might be missing something.

Buffer implementation is part of the javascript bundle I vendor: https://unpkg.com/@vaxxnz/nzcp@0.1.5/dist/esbuild/browser.js.

I don't expose any Buffer interfaces, so it's guaranteed I always originate the usage of Buffer inside the library. While Buffer.name gets mangled and can differ, Buffer instance itself is the same inside the bundle.

If I were to expose some Buffer interfaces, I could run Buffer.from() on them to make sure I'm using the right Buffer implementation. It's not ideal, but workable.

What's a scenario when this would break down?

Cheers.

[noway]

The workaround from #164 (comment) solves this issue for me, so I going to close this pull request.