Because char's range has a hole from 0xd800 to 0xd8ff (surrogate pairs [1]) so n... | Hacker News

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		lifthrasiir on July 23, 2020 \| parent \| context \| favorite \| on: Rust explained using easy English Because char's range has a hole from 0xd800 to 0xd8ff (surrogate pairs [1]) so not all u16 values (or larger) can be safely converted to char. [1] https://en.wikipedia.org/wiki/UTF-16#U+D800_to_U+DFFF

ChrisSD on July 23, 2020 [–]

Additionally Unicode only goes up to U+10FFFF (1,114,112 code points) which is far short of a full 32 bits (4,294,967,295 values).

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