Because it raise ValueError in parseInt and parseFloat function
[https://github.com/nim-lang/Nim/blob/73553621a11f043bad9cc18cfde525709c49ad7e/lib/pure/strutils.nim#L1116](https://github.com/nim-lang/Nim/blob/73553621a11f043bad9cc18cfde525709c49ad7e/lib/pure/strutils.nim#L1116)
