Supporting anti-clockwise arcs

[karljs]

I would like to see support for the optional parameter to the arc function that allows drawing anti-clockwise arcs (see the MDN docs)

Adding another parameter (such as Maybe Bool) to the Arc type breaks backwards compatibility for folks, so I don't know how the maintainers feel about that. It might be possible to establish some standard alternative approach based on an extensible record.

Thoughts?

[paf31]

What's the difference between setting this flag and flipping the two angle arguments?

[karljs]

My main issue with that is when using arc as part of a path, flipping the arguments can result in unexpected fill behavior. I haven't been able to find any other workaround.