Handle non-unique index

[hombit]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 98.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.40%. Comparing base (1a2a1d2) to head (b652f7a).
Report is 49 commits behind head on main.

Files with missing lines	Patch %	Lines
src/nested_pandas/nestedframe/core.py	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   99.49%   99.40%   -0.10%     
==========================================
  Files          14       14              
  Lines         985     1003      +18     
==========================================
+ Hits          980      997      +17     
- Misses          5        6       +1     

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[github-actions]

Before [1a2a1d2]	After [b13b786]	Ratio	Benchmark (Parameter)
38.6±7ms	43.9±6ms	~1.14	benchmarks.ReassignHalfOfNestedSeries.time_run
7.92±0.1ms	8.18±0.3ms	1.03	benchmarks.NestedFrameQuery.time_run
1.57±0.01ms	1.59±0.02ms	1.01	benchmarks.NestedFrameReduce.time_run
266M	266M	1.00	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
22.6±0.6ms	22.5±0.5ms	1.00	benchmarks.AssignSingleDfToNestedSeries.time_run
88.3M	88.1M	1.00	benchmarks.NestedFrameAddNested.peakmem_run
9.09±0.1ms	9.14±0.1ms	1.00	benchmarks.NestedFrameAddNested.time_run
93M	93.3M	1.00	benchmarks.NestedFrameQuery.peakmem_run
91.8M	91.9M	1.00	benchmarks.NestedFrameReduce.peakmem_run
285M	285M	1.00	benchmarks.ReassignHalfOfNestedSeries.peakmem_run

Click here to view all benchmarks.

[wilsonbb]

Looks good to me! Minor suggestions including fixing one of my own typos haha