Record keys should be string | number | symbol instead of only string

[user753]

For example I what to do this

    R.fromFoldable(array)([[1, "foo"]], x => x)

Is there any reason to use only strings?

[WhiteAbeLincoln]

I have the same use case, as I'm trying to write an invert object function (swaps keys and values), and I don't want to limit my input record to only string values. String | Number | Symbol gives a little more freedom in values

[raveclassic]

TS even has an alias - PropertyKey

[gcanti]

Tried to change the constraint a couple of times in the past, too complex