I actually used sqids algo for something very different where I had to encode arbitrary sized byte arrays. And with Ruby it was very simple to remove limit - I think it was matter of monkey-patching https://github.com/sqids/sqids-ruby/blob/main/lib/sqids.rb#L... to return infinity.

The reason for the limit is most likely to ensure interoperability with libraries in other languages where working with bignums is much more complicated.