> Yes canOverflow can produce NameNotFound in theory.
It means, when using library function `proc someFn() {.raises: ErrorCode.}` \-
there's no way to understand what are the special cases (errors) for this proc
and how they should be handled. Basically it's as good as using `int` instead
of `ErrorCode` \- basically, loosing the type safety.
Basically, it's same as using huge `FlagCode` enum for everything `proc
openFile(fname: string, flag: FlagCode)` and `proc startHttpServer(port: int,
flag: FlagCode)`.
Maybe it's better to be clear about what it is - a way to achieve high
performance, with the cost of loosing type safety and readability. And use
plain `int` instead of `ErrorCode`.
