declare missing mapper-Property

[hbongen]

@closes #58

[DannyvdSluijs]

Hi @hbongen Nice to see this PR. It seems to be a duplicate of #56. Also this repo seems to be inactive since quite some time already. Ive been in contact with the maintainer to become a co-maintainer as he indicated to no longer be working on this. Sadly it never got to this point of becoming a co-maintainer.

[hbongen]

Hi @DannyvdSluijs. Yes it is a duplicate. Didn't see this because I have not found a correlated Issue.
What's your plan at the maintenance topic? I do not need additional Features, so if there is a maintained fork I would really appreciate it.

[DannyvdSluijs]

I could look into making my fork updated with the pending PR's (since I'm the author on many of them). This would take some time though so don't pin me on a date.

[DannyvdSluijs]

Ive tried to make a fork with the open PR’s but I don’t have the time available for maintaining a fork let alone migrate the largest libraries over to the fork. Effectively making my efforts void.

I’m still open to take on the maintenance of this repo but until the original maintainer would allow this we are kind of stuck it seems.