Export is_na()

[nbenn]

Is there a reason why is_na() and any_na() are not exported (apart from the mssing argument checks as mentioned)? I need base::complete.cases() functionality for a data.table and the only efficient way I found was using data.tables:::is_na(). Or am I missing something? Happy to submit a PR.

[jangorecki]

I don't think API to those function is going to change anytime soon so should be safe to export them. PR is welcome.

[DavidArenburg]

Nice, didn't know about these.

[MichaelChirico]

@DavidArenburg that's as good an argument as any to export them! I can't say I knew of any_na myself

[DavidArenburg]

@MichaelChirico Not sure if this is always the case. There are some functions in data.table source code which aren't mature enough for everyone be able to use them safely, but these two look pretty harmless to me.