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> The current scheme is extensible to 7x6=42 bits (which will probably never be needed).

I have printed this out and inserted it into my safe deposit box, so my children's children's children can take it out and have a laugh.

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Unicode 13 uses 143859 code points. 21 bits can encode more than 10x of that. And there are not that many languages left to add. We are already debating elvish. I am not sure what would warrant extending the coding scheme if we are already on the level of fictional languages today. Also note that many things like flags or emoji skin colors, etc. are now done via grapheme clusters, which conserves code points.

I have stapled your reply to the original printout for extra hilarity! :)

You can actually extend it indefinitely, 42 bits is just the farthest you can go by trividally extending the bit patterns with the existing logic.

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