x == NA instead of is.na(x)

[jabranham]

It would be useful to have a linter that checks for x == NA where I meant to write is.na(x). Is that possible?

[jimhester]

It is definitely possible and probably correct in most cases. Can you think of any cases where you actually would want to use x == NA instead of is.na(x)?

[jabranham]

I can't - x==NA will just return NAs for all values of x. That doesn't seem helpful to me.