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sub _utf8_on_all_arrayref {
    require Encode;
    Encode::_utf8_on($_) for map @$_, @{$_[0]};
    $_[0];
}

sub _utf8_on_all_arrayref {
    require Encode;
    Encode::_utf8_on($$_) for map \(@$_), @{$_[0]};
    $_[0];
}