A common source of remote exploits in Nim is that of `enum` conversions done
like so:
type X = enum
Z
var a = 42
var b = X(a)
Run
This will fail with a `RangeDefect` which subsequently crashes the application
- unfortunately it gets used liberally in code we review, often when dealing
with untrusted data, for example coming from the network or a file.
The (fairly) safe way around this is of course a `case` expression:
case a of
ord(Z): Z
else: ...
Run
but it gets tedious - any better alternatives out there? A few non-starters
include try/catch (`Defect` cannot be caught in some dialects of Nim), low/high
checks (doesn't work with gappy enums).
Winner gets an entry in the [style
guide](https://status-im.github.io/nim-style-guide/) :)
