REF: implement size for 2D compat

[jbrockmendel]

xref pandas-dev/pandas#28389

[xhochy]

This probably should wait until the pandas PR is merged?

[jbrockmendel]

This probably should wait until the pandas PR is merged?

This should be correct regardless of if/when 28389 is merged. My preference would be to get it over with, but not gonna lose sleep over waiting a bit.

[codecov]

Codecov Report

Merging #81 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
+ Coverage   86.54%   86.67%   +0.13%     
==========================================
  Files          16       16              
  Lines        1159     1163       +4     
==========================================
+ Hits         1003     1008       +5     
+ Misses        156      155       -1

Impacted Files	Coverage Δ
fletcher/base.py	94.63% <100%> (+0.47%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 99b8f12...8471c36. Read the comment docs.

[xhochy]

Thanks @jbrockmendel !