The meme format is awesome, but JSON differentiates strings with ".

{ "key": 1337 } vs { "key": "1337" }.

You might be thinking yaml? (Though it supports ' and " for explicit string types, technically)

But integer vs float? Good luck.

Timestamp in UTC

But for time of day, use local time and store separate column with the timezone name. Don’t use timezone offsets since that doesn’t work with DST. You’re better off with something like America/New_York because God knows what 2030 will look like.

And if timezone are abolished, or DST, that’s even more reason to store the timezone name.