There are still more recent additions to this index:
http://cryptopopcorn.com/Crypto/js/Simple/simpleindex.html
The question comes about when are values numbers or simply characters.
For example, standard numbers do not have leading zeros but groups of digits as mere characters can. Placements of spaces between integers makes since but spaces between character groups are optional, even to the quantity of standard characters in displayed groups.
Personally, I usually write so that spaces between groups are disregarded, so if any are present or in what might be considered a wrong place, it does not matter in decryption. I've seen many examples of not following that principle.
With true integer numbers, base 10 or other, spaces are critical as separators, so sequential multiple spaces or off characters should be reduced to only one between values.
The possibilities for ever more functional useful cryptographic algorithms, themes and useful variations, are endless so don't believe else. The more multitudinous the sources of similar cipher texts, the greater the confusion(good) in the attacker. Or, you could also be dumb and announce(bad) by banner what you are doing. This should not be truth or dare unless you also can mislead.
WTShaw