show_option_none not working in meta box

I edited the codex to be more clear, but it already IS clear: This option forces the value to be “-1” so NONE can be selected. So ‘show_option_none‘ and ‘selected‘ don’t play well together. I also saw that the “selected” string (/wp-includes/user.php – line 1010) is placed directly after the value attribute without a space. Could you check your sourcecode and verify this?

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