(As far as I know, this limit is only enforced client-side. It is possible to circumvent the check and send 280 characters/560 bytes...
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Binary encodings using non-power-of-two Unicode character counts are possible but generally more inconvenient to implement.
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With a power of two, you just dice the bits up and then put them back together in different groupings.
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There are 0x1100 = 4352 good characters, and 1109760 bad ones.
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A currently-unanswered question is how many of the good characters are "safe".
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"Safeness" was a concept I defined while initially developing Base65536: https://github.com/qntm/base65536gen#what-makes-a-character-safe …
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I suppose I shall have to dig that old code out and do some further number crunching...
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I think I'm going to call these characters "light" and "heavy" rather than "good" and "bad".
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End of conversation
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