lib/strings: Improve error message for octal ambiguity in toInt

       => 123

       toInt "00024"

       => error: [json.exception.parse_error.101] parse error at line 1, column 2: syntax error

       while parsing value - unexpected number literal; expected end of input

       => error: Ambiguity in interpretation of 00024 between octal and zero padded integer.

       toInt "3.14"

       => error: floating point JSON numbers are not supported

      parsedInput = fromJSON (elemAt strippedInput 0);

    in

      if isLeadingZero

      then throw "Ambiguity in ${str} between octal and zero padded integer."

      then throw "Ambiguity in interpretation of ${str} between octal and zero padded integer."

      else if strippedInput != null && isInt parsedInput

      then parsedInput

      else throw "Could not convert ${str} to int.";