[Bug localedata/23290] New: IBM273 is not equivalent to ISO-8859-1

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23290

            Bug ID: 23290
           Summary: IBM273 is not equivalent to ISO-8859-1
           Product: glibc
           Version: 2.28
            Status: NEW
          Severity: normal
          Priority: P2
         Component: localedata
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: libc-locales at sourceware dot org
  Target Milestone: ---
             Flags: security-

We map this codepoint to a non-Latin-1 character:

<U203E>     /xbc         OVERLINE

However, the intent was to make this encoding a permutation of ISO-8859-1, and
our mapping breaks this.  ICU has something like this:

<U20AF>     /xbc         MACRON

And according to the IBM and Unicode websites, the ICU mappings reflect IBM's
intent.

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