#311 impl for defining MappingStyle and SequenceStyle via Annotation

[lqdchrm]

My take on implementing #311

Not sure how to add tests for it though...

PS: Merry Christmas :-)

[juval1]

It has been two years since this fix has been committed, is there a plan to push it in to the master branch?

[aaubry]

It's missing tests that show that the feature works as intended. I can't merge this without tests and I don't have time to develop them myself. If someone wants to do it, I'll gladly merge the code.

[EdwardCooke]

This PR appears to be abandoned, it's over a year old. I'm going to close it.