Fix .nest[...] = pd.Series

[hombit]

Previously it failed because compared "nested" and "flat" indices, which cannot be equal.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.56%. Comparing base (be2b7a6) to head (4375c59).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #63   +/-   ##
=======================================
  Coverage   97.55%   97.56%           
=======================================
  Files          16       16           
  Lines         818      820    +2     
=======================================
+ Hits          798      800    +2     
  Misses         20       20           

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[github-actions]

Before [be2b7a6]	After [6a507ce]	Ratio	Benchmark (Parameter)
31.7±2ms	33.6±1ms	1.06	benchmarks.AssignSingleDfToNestedSeries.time_run
255M	260M	1.02	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
85.8M	85.8M	1	benchmarks.NestedFrameAddNested.peakmem_run
88.2M	88.3M	1	benchmarks.NestedFrameQuery.peakmem_run
88.2M	88.2M	1	benchmarks.NestedFrameReduce.peakmem_run
272M	273M	1	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
8.81±0.1ms	8.73±0.2ms	0.99	benchmarks.NestedFrameQuery.time_run
8.42±0.1ms	8.26±0.1ms	0.98	benchmarks.NestedFrameAddNested.time_run
5.29±0.06ms	5.13±0.06ms	0.97	benchmarks.NestedFrameReduce.time_run
58.3±3ms	56.3±2ms	0.97	benchmarks.ReassignHalfOfNestedSeries.time_run

Click here to view all benchmarks.

[wilsonbb]

Looks good with ideally a unit test added later