I read JCR-854, and see that nt:folder does not allow same name sibling (children), which i guess makes sense from a directory point of view. Originally this was fine as i used the name of the 'real' document as the name of the node, and avoided name collisions.
Then i continued to run into a myriad of problems because there are restrictions on node names, that make it tedious (at least to me) to do. So i decide switching to a constant node name 'File', and storing the 'real' name as a property. But i soon found out nt:folder doesn't allow same name siblings. So the question is, how does one generally do this? Is there some provided JCREncoder/Decoder class that will mangle any name into a node name exceptable name? Or can you override nt:folder to allow same name siblings?