[1] "−" - Charinfo ( 版) <https://chars.suikawiki.org/char/2212>
[2] Fix #21: Japanese encoders have special treatment for U+2212, not U+2022 · whatwg/encoding@95f85a6 ( 版) <https://github.com/whatwg/encoding/commit/95f85a63ad4d6b6331f21ff60f9244b3bcbe6d84>
[3] XQuery 3.1: An XML Query Language () <https://www.w3.org/TR/2017/REC-xquery-31-20170321/#id-static-decimal-format-minus-sign>