[technion]

     (bad acting) NIFs. Thankfully you can mark 'em as the dirty evil little things that they are (with negligible overhead): 

As a side issue, is there an easy method to determine if a NIF is problematic in this regard? I've used jiffy[0] in several codebases, but I keep reading these warnings and wondering whether I should be doing so.

[0] https://github.com/davisp/jiffy

[dozzie]

The warnings are mostly about NIFs you write yourself, which you typically avoid if possible. And jiffy itself goes quite a long way to cooperate with Erlang VM's internals (at least so I've heard).