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From :help hidden-options:
>Not all options are supported in all versions. This depends on the
>supported features and sometimes on the system. A remark about this is
>in curly braces below. When an option is not supported it may still be
>set without getting an error, this is called a hidden option. You can't
>get the value of a hidden option though, it is not stored.
>
>To test if option "foo" can be used with ":set" use something like this:
> if exists('&foo')
>This also returns true for a hidden option. To test if option "foo" is
>really supported use something like this:
> if exists('+foo')
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