[1] "−" - Charinfo (2015-12-16 12:31:25 +09:00 版) https://chars.suikawiki.org/char/2212

[2] Fix #21: Japanese encoders have special treatment for U+2212, not U+2022 · whatwg/encoding@95f85a6 (2015-12-16 12:31:41 +09:00 版) https://github.com/whatwg/encoding/commit/95f85a63ad4d6b6331f21ff60f9244b3bcbe6d84

[3] XQuery 3.1: An XML Query Language (2017-03-20 09:23:33 +09:00) https://www.w3.org/TR/2017/REC-xquery-31-20170321/#id-static-decimal-format-minus-sign