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$ perl -MData::Dumper -E'
    $Data::Dumper::Useqq = 1;
...
    say $h{$_} || 0;
'
1

$ perl -E'
    $Data::Dumper::Useqq = 1;
...
    say $h{$b} || 0;
'
0

$ perl -MUnicode::Normalize=NFC -E'
    $Data::Dumper::Useqq = 1;
...
    say $h{$b} || 0;
'
1