For like more than a year. It was introduced in Build 154002, on 23 Apr 2012.

I think he means the edit data being present, that was since Spring of this year, if I remember right. Even if skeleton exporting was there before, we couldn't export it due to the lack of edit data. (On the other hand, I think the skeletons still export broken though, because fbx.)

Yeah I noticed Blender can't import either the OBJs or the FBXs exported from SeriousEditor at all. Noesis even has a problem with them.

Sigh. Using FBX seems to has been a big mistake. It was supposed to bring compatibility between all 3d packages, but all it brought was a lot more incompatibilities. Autodesk really messed that one. We spent more time fixing bugs related to their bad and undocumented libraries, than we would have spent have we implemented importers/exporters for 2-3 additional 3d packages. Well.... hindsight is 20/20. :)

I haven't seen a single exchange format that ever fulfilled its promise. Collada DAE is another inconsistently implemented one. :/

Well, we do have our own ascii formats, and when we were implementing specific exporters/importers for our format as plugins in different 3d packages, it worked well. It is more work, but then it works well at least.