REF/PERF: MultiIndex.get_indexer with method

[lukemanley]

• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/v2.2.0.rst file if fixing a bug or adding a new feature.

from asv_bench.benchmarks.multiindex_object import Integer b = Integer() b.setup() %timeit b.time_get_indexer_and_backfill() # 238 ms ± 39.6 ms per loop (mean ± std. dev. of 7 runs, 1 loop each) -> main # 50.6 ms ± 2.98 ms per loop (mean ± std. dev. of 7 runs, 10 loops each) -> PR %timeit b.time_get_indexer_and_pad() # 191 ms ± 30.3 ms per loop (mean ± std. dev. of 7 runs, 10 loops each) -> main # 50.4 ms ± 1.03 ms per loop (mean ± std. dev. of 7 runs, 10 loops each) -> PR 

[WillAyd]

Nice! Always great to improve performance while reducing code.

A cursory glance tells me the failures are unrelated but worth merging main to be sure

[mroeschke]

Thanks @lukemanley (yeah these failures are not related)