[Deque]

Thanks, Psycho.

I believe it is the base64 algorithm that is giving the problem. Of course, my function is fucking up original cases, this might hurt the encoding, but I don't think it's the leet algorithm to cause some error.

No, it's the leet. The base64Variant throws the error, because it gets a character that isn't recognized. It is no valid base64 string that is given by the leet function, which means it doesn't decode the same as it encodes (note that it got a perfect base64 string but after decoding the same it returned something different, you can see that in the output).

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I haven't even touched base64.

No, you have used atom128 and zong22 which are base64 variants (same algorithm, same alphabet, but different order of the characters).

I agree with the descriptions. They really should be added.