"This 2-byte, fixed-width encoding, "UTF-16""
But UTF-16 is "encoded with one or two 16-bit code units" (cf Wikipedia), hence it is a variable length 2 or 4 bytes encoding.
UTF-32 is a fixed-width encoding
Also, UTF-8 can be 1 to 4 bytes, the last 4th byte represents code points U+10000 to U+10FFFF.
You're right. When UTF-16 was introduced, it was fixed-width. But -- to accommodate 4-byte-width characters -- it's now a variable-width encoding. I'll edit the text to clarify that. Thanks!
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