Duplicates found

[doncadavona]

Hi, I have found a duplicate using this alphabet:

KStk7TsjCQxpmvcDUnVe1Zi2gJlo3WqdPYw584BHXGrfR9MzAbaIuy60NhFELO

Using this set of alphabet, the integer 54 and 45 generates the same Sqids.

See that regardless of minimum length, the Sqids are same for 54 and 45.

Notice that UKkLWZg9DA duplicates are also generated using the default alphabet, with the numbers 63 and 123:

Is this expected? What to do when we have duplicates? Am I to reshuffle the alphabet?

See it in https://sqids.org/playground.

Why is this an issue? Because the generated IDs are supposed to be unique, as said in FAQ:
https://sqids.org/faq#uniqueness

[doncadavona]

I apologize, I didn't notice that the seemingly same IDs are actually unique by case:

Using the default alphabet, the IDs 63 and 123 generate the following strings, notice that they are not the same by case:

UkKLWZg9DA
UKkLWZg9DA

The problem I was having was that I was generating sqids for my existing MySQL table that was actually unique, but case-insensitive.

The solution to ensure that the unique table column is unique and case-sensitive.