Comment 51 for bug 1846423

(In reply to OpenJD from comment #39)
> Well as it's chaining inequality comparisons (to catch wrong types), it will work; if you follow the link to the full source code of this file, this is how the other elements are tested.
> I'm not sure this is the most optimal way to test it (maybe it is, I don't know of the preprocessor will optimize it, and my knowledge of this kind of stuff is very far), but I chose to keep the code rules already present in the file :)
> (And yes, it woulf be really great if an active developer could see this and validate it for the next release...)

Geoff, is that a patch you could review and help uplift into Thunderbird, as you recently worked on Calendar?