From: "mame (Yusuke Endoh)" Date: 2022-02-24T13:37:51+00:00 Subject: [ruby-core:107738] [Ruby master Bug#18590] String#downcase and CAPITAL LETTER I WITH DOT ABOVE Issue #18590 has been updated by mame (Yusuke Endoh). duerst (Martin D��rst) wrote in #note-8: > > Is it okay? > > I reported to Unicode that they should check it an clarify how this chart was made. I see, thanks! > > Should it be replaced with https://www.unicode.org/Public/UCD/latest/ucd/SpecialCasing.txt ? > > In the Ruby documentation, probably yes. SpecialCasing.txt is an official Unicode data file. The case charts are just a Web page. But the case charts may be easier to understand for non-experts. It's certainly easy to understand, but if it's wrong, I don't think it's even worth considering. I wanted to create a PR to fix the document, but I am unsure what document is the best reference for full case mapping. @duerst Could you please fix it? Or should we wait until the chart will be fixed? ---------------------------------------- Bug #18590: String#downcase and CAPITAL LETTER I WITH DOT ABOVE https://bugs.ruby-lang.org/issues/18590#change-96664 * Author: andrykonchin (Andrew Konchin) * Status: Open * Priority: Normal * Assignee: duerst (Martin D��rst) * ruby -v: 3.1.0p0 * Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- Downcasing for "��" character works in an unexpected way: ```ruby '��'.downcase => "i��" ``` Expected result - downcasing should return "i". Instead, it returns small "i" and additional "dot" character: ```ruby '��'.downcase.chars => ["i", "��"] ``` According to the standard Unicode case mapping character '��'(0130) maps to lowercased 'i' (0069). ``` 0130;LATIN CAPITAL LETTER I WITH DOT ABOVE;Lu;0;L;0049 0307;;;;N;LATIN CAPITAL LETTER I DOT;;;0069; ``` https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt -- https://bugs.ruby-lang.org/ Unsubscribe: