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$ perl -CS -wE'no  feature qw( unicode_strings ); $_="\xEB"; utf8::dow
+ngrade($_); say /\w/||0; say uc;'
0
...
$ perl -CS -wE'use feature qw( unicode_strings ); $_="\xEB"; utf8::upg
+rade($_);   say /\w/||0; say uc;'
1
Ë

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$ corelist -a Unicode

...
  v5.13.2    5.2.0     
  v5.13.3    5.2.0     
  v5.13.4    5.2.0