Is isDigit() really deprecated? I can not imagine a reason. [https://github.com/nim-lang/Nim/blob/devel/lib/pure/strutils.nim#L144](https://github.com/nim-lang/Nim/blob/devel/lib/pure/strutils.nim#L144)
For the question, google points us to [https://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Nim](https://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Nim)
