Display type correctly for array if obj passed as an array

[ilyasakin]

If we pass an array instead of an object in the JSON file.
It throws an error like this; Data must be an object. Found object. which makes no sense.

This happens because typeof operator returns 'object' if you pass an array as an operand.

So, we should use Array.isArray to determine whether the passed value is an array instead of using typeof operator. We can use typeof as a fallback.

[typicode]

Thank you!

[striezel]

The merge of this pull request seems to break the CI workflow: https://github.com/typicode/json-server/actions/runs/4170357594/jobs/7219243004

It should probably be adjusted or reverted.