Note that, whatever solution is implemented, we'd have to do this for all the plotting routines that take plural kwargs.

Consistency concern is valid for more than just contour, see the api doc for pyplot http://matplotlib.org/api/pyplot_api.html

• For color: color and c, color
• For linestyle: linestyles or linestyle or ls or linestyle or linestyles or dashes
• For linewidth: linewidths or linewidth or lw or linewidth or linewidths or lw
• For edgecolor: edgecolor or ec or edgecolor or edgecolors
• For faceolor: facecolor or fc or facecolor or facecolors

and others, I'm sure

Will require deciding combinations to keep and applying consistently across all. The easiest would be to just take the union of all the currently valid variants across methods for a particular keyword (e.g., edgecolor or edgecolors or ec).

I recommend labeling with Difficulty: Medium and Documentation

See also #2369 for thoughts on what to do with extra (though not typo'd) keyword arguments.

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I think this is still a valid concern. Probably requires some discussion, however I'd be in favour of aliasing these

Now that ContourSet has been modified to actually be an artist, we should just route most kwargs to Artist.set() and let that handle standard aliases and error out as usual on unknown properties.