[Dune] Id for a non-boundary intersection

[Arya Fallahi]

Dear Duners,

I need to use a tag for a surface in a mesh which is not a boundary. If it
is a boundary, I can easily call intersect->boundaryId() and retrieve its
tag. However, if the surface is not a boundary this function does not work.
Is there any way, I can extract the Id of surfaces which are not
boundaries? I will be thankful for any recommendation.

Best regards and thanks in advance for your help,
Arya
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