##
$ perl -E'
$Data::Dumper::Useqq = 1;
$a = "e\x{301}";
$b = "\xE9";
$h{$a} = 1;
say $h{$b} || 0;
'
0
##
##
$ perl -MUnicode::Normalize=NFC -E'
$Data::Dumper::Useqq = 1;
$a = NFC("e\x{301}");
$b = NFC("\xE9");
$h{$a} = 1;
say $h{$b} || 0;
'
1