refactor(shared): simplify isPrimitive()

[parkin-lin]

simplify isPrimitive()

[patak-dev]

Could you provide more context about why we should adopt this simplification? Won't this be creating new Objects to garbage collect after the change?

[parkin-lin]

Sorry, I'm not thinking specifically about memory or speed optimisations here, as this isPrimitive() method isn't being called multiple times in the critical path.
It's just a logical simplification in code style, so if it's not more readable, maybe we can close this PR. Thanks for your feedback.

[patak-dev]

thanks for the PR, but yes, let's close it for now and apply these kind of changes when there is a clear optimization or fix.