Blender Git Loki

remove support for rna resolving paths with collection['name'], only support collection["name"],
added r31826.

This is valid python syntax but I rather be strict with data path format else it becomes harder to parse them if we try to support this.
it means checks like fcurve.data_path.startswith('pose.bones["SomeBone"]') isn't ensured to work, since blender uses "" quotes everywhere for keyframe paths I dont think its an advantage to allow users to do it differently.