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@aral @blogdiva Hah, I'd missed that you said secret key. I seem to recall that was the original idea behind emoji-based codes, though they also look cool.

I ran a script over https://unicode.org/Public/emoji/16.0/emoji-sequences.txt and only got 1185 that don't require 2 codepoints, so you're right. I did test with one codepoint sequence and confirmed it only uses a single character of my Mastodon character limit, so I may still publish an implementation just for fun.