Strictly speaking, the mapping isn't 1-to-1. U+2660 can't be encoded in iso-8859-1
The claim is that iso-8859-1 maps 1-to-1 to Unicode, not that Unicode maps 1-to-1 to iso-8859-1. A 1-to-1 mapping is also known as an injection. The claim wasn't that it's a bijection (aka 1-to-1 correspondence).
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