[tex-eplain] TeX--XeT

[Karl Berry]

    If I remember correctly, Unicode is 4 bytes 

No. For the record, Unicode has 1,112,064 valid code points, organized
into 17 "planes" of 2x16 slots.
https://en.wikipedia.org/wiki/Unicode#Architecture_and_terminology

    and UTF-8 has a variable number of bytes

That is true. One to four bytes.
https://en.wikipedia.org/wiki/Unicode#Mapping_and_encodings

No need for further discussion of Unicode architecture here :). -k