TST: correctly mark test_options in test_yahoo to skip
BUG: GH4017, efficiently support non-unique indicies with iloc
PERF: getting an indexer with a non_unique index, now MUCH faster
PERF: vbench for loc/iloc with dups

BUG: sparse reindex needed takeable arg

TST
BUG: correctly interpret tuple/list in non_unique indexers