[AdrianB1]

Not even a bug, it's one of the inner working things you may or may not know about. I see it more than a trap than a bug. Honestly, there are other parts of IT that have it, the most familiar to me is SQL where you can run the same query in 10 seconds or 20 milliseconds and only experienced DBAs can tune it properly, in many cases without touching the query itself.

[Pxtl]

Traps are bugs. If you're making a library and you don't treat traps as bugs, it's a bad library.