Should fix #405

[mkuemmel]

Not an elegant solution for #405, but it works. I am wondering whether other keywords are also exposed.

[ayllon]

I am wondering whether other keywords are also exposed.

Probably yes. I think we need something more flexible and future-proof, so we do not have to tweak keyword per keyword.
If it is urgent, we can merge this as a temporary workaround, though.

[mkuemmel]

Mario, the person from OU NIR, lost some time on this, also since the error is not really transparent.

I understand that the problem is kind of structural since the STL struct that holds the keywords is type safe but the FITS standard is not.

It's kind of a bug that could affect also other users, I would just use this now as a temporary fix.

[marcschefer]

Well, maybe we can open an issue for a more in-depth fix to be done later so that we don't forget?

[mkuemmel]

I can do that, no problem.

[ayllon]

As a temporary fix, worth getting it into the codebase before a more generic fix is done