ENH: either support MultiIndex or raise an error when one is given

[u3ks]

Closes #606

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.0%. Comparing base (4037c70) to head (df2864f). Report is 60 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/pysal/momepy/pull/622?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) ```diff @@ Coverage Diff @@ ## main #622 +/- ## ======================================= + Coverage 97.4% 98.0% +0.6% ======================================= Files 26 38 +12 Lines 4328 6223 +1895 ======================================= + Hits 4214 6097 +1883 - Misses 114 126 +12 ``` | [Files](https://app.codecov.io/gh/pysal/momepy/pull/622?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) | Coverage Δ | | |---|---|---| | [momepy/functional/\_elements.py](https://app.codecov.io/gh/pysal/momepy/pull/622?src=pr&el=tree&filepath=momepy%2Ffunctional%2F_elements.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal#diff-bW9tZXB5L2Z1bmN0aW9uYWwvX2VsZW1lbnRzLnB5) | `99.2% <100.0%> (ø)` | | | [momepy/functional/tests/test\_elements.py](https://app.codecov.io/gh/pysal/momepy/pull/622?src=pr&el=tree&filepath=momepy%2Ffunctional%2Ftests%2Ftest_elements.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal#diff-bW9tZXB5L2Z1bmN0aW9uYWwvdGVzdHMvdGVzdF9lbGVtZW50cy5weQ==) | `99.0% <100.0%> (ø)` | | | [momepy/functional/\_shape.py](https://app.codecov.io/gh/pysal/momepy/pull/622?src=pr&el=tree&filepath=momepy%2Ffunctional%2F_shape.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal#diff-bW9tZXB5L2Z1bmN0aW9uYWwvX3NoYXBlLnB5) | `99.1% <80.0%> (ø)` | |