range EOutOfRange for 12 in range[0..23]

[onionhammer]

Noticed this with the times module when my application was crashing calling format("h"), internally times is doing something akin to this:

https://gist.github.com/onionhammer/7518186

This seems to only happen when if: else: is ternary and the compared value is half of the maximum value + 1;

e.g. (pseudocode)

r = range[0..23]
return if r > 12: r - 12: else: r

r = range[0..45]
return if r > 23: r - 23 else: r

type TSomeRange = object
  hour: range[0..23]

var value: string

#Works
var val6 = TSomeRange(hour: 6)
value = $(if val6.hour > 12: val6.hour - 12 else: val6.hour)
echo value

var val14 = TSomeRange(hour: 14)
value = $(if val14.hour > 12: val14.hour - 12 else: val14.hour)
echo value

#With 12, works
var val12 = TSomeRange(hour: 12)
if val12.hour > 12: value = $(val12.hour - 12) else: value = $val12.hour
echo value

#Crashes
value = $(if val12.hour > 12: val12.hour - 12 else: val12.hour)
echo value