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It's a bit confusing that the "Random hex" example contains characters such as "q" and "p".

I don't understand your question :o

Hex is 0-9, a-f. P and q are outside that character set.

yes, you are right onei, it is supposed to be random string instead of hex, I am sorry I made that mistake

fixed it in the blog, thanks for pointing it out amelius ;-;