[O] [bug, ox-latex] Parsed keywords and export with subscript

[Rasmus]

Hi,

It would seem that parse doesn't behave correctly when
org-export-with-sub-superscripts is turned off via #+options.

Example:

    #+options: ^:nil
    #+date: a_b
    * test
    a_b

Exported result with ox-latex:

    %% ...
    \date{a\(\_b\)}
    %% ...
    \section{test}
    a\_b
    %% ...

Expected result 

    %% ...
    \date{a\_b}
    %% ...
    \section{test}
    a\_b
    %% ...

Perhaps I'm misunderstanding how a parsed keyword is supposed to do...

Thanks,
Rasmus

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