One might expect ab\,cdEF\,GHij\,klMN\,OPqr\,stuv,wx

Not if one followed the documentation.

"\Qab,cd\Uef,gh\Lij,kl\Emn,op\Eqr,st\Euv,wx\n"
 Q--------------------       *      *
        U-------------
               L------

* - Ends active transforms. There are none, so no-op.
[download]

Now, the documentation doesn't state what happens when both \U and \L are in effect, but Perl does what you'd expect (last one encountered rules).

"\Qab,cd\Uef,gh\Lij,kl\Emn,op\Eqr,st\Euv,wx\n"
 Q----------------------     *      *
        U------L--------

   |
   v

"ab\\,cdEF\\,GHij\\,klmn,opqr,stuv,wx\n"

* - Ends active transforms. There are none, so no-op.
[download]

Update: Wait! That's not what Perl gives. Argh, not my day. There's a bug :( (in the docs if not in the interpreter).

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