collation bugs involving UNDEFINED in glibc (cvs 2 days ago), with illustrative app and commented output

[Manuel Novoa III]

Hello,

The attached app illustrates several problems in glibc's handling
of implicit/explicit UNDEFINED entries in collation.  The problem(s)
may lie in the collation code, in localedef, or both.  See the
annotations in the comment header for details.

Manuel

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