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    my $Bro = Data::HyperLogLog::Shared->new_readonly($m);

    my $A = Data::HyperLogLog::Shared->new(undef, 14);   # same precision
    $A->add("local");
    $A->merge($Bro);   # must read Bro's registers without locking its PROT_READ map
    ok $A->count >= 1, 'merge target reflects its own + frozen-other items';
}

done_testing;

# minimal exception helper (avoid a Test::Fatal dependency)
sub exception {
    my $code = shift;
    my $err;
    { local $@; eval { $code->(); 1 } or $err = $@; }
    return $err;
}