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    ${^FS_ENCODING}{foo} = 'A';
    ${^FS_ENCODING}{foo}{bar} = 'B';
...


    open my $fh, ">", "/foo/bar/baz/quux/blah/hello.txt";

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    open my $fh, ">", join("/",
        ""
...
        encode(detect_encoding("/foo/bar/baz/quux"), "blah"),
        encode(detect_encoding("/foo/bar/baz/quux/blah"), "hello.txt")
+,
    );