After legacy/trac#9652 is fixed, we should also provide a way to specify which transports a bucket prefers. Something along the line of: ``` FILE_BUCKETS = { "name1": {"size": 10, "pt": ["obfs2", "obfs3"]}, "name2": {"size": 15}, "foobar": {"size": 3, "pt": ["obfs3"]}} ``` Which will result in the "name1" bucket containing 10 bridges, where most will support obfs2 and/or obfs3. "name2" bucket will contain 15 bridges, but has no preference for pluggable transports, and "foobar" will contain 3 bridges where most will be obfs3 bridges.