chore: use isArray and isBuffer

[is2ei]

Changed it to use isArray and isBuffer instead of instanceof. I simply measured performance and found isArray is faster than instanceof.

• https://github.com/is2ei/perf_Node_isArray
• https://github.com/is2ei/perf_Node_isBuffer

Also, I think isArray and isBuffer are more readable.

Checklist

• [x] run npm run test and npm run benchmark
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message and code follows the Developer's Certification of Origin and the Code of conduct