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So it's using the VP8 arithmetic coder - how does that stack up compared to rANS?

rANS is really cool, but I think we tried it too early in the lepton research phase while some of the other ideas were still brewing... We might revisit rANS now that v1.0 is out!

WebP is switching to rANS: https://chromium-review.googlesource.com/#/c/338781/

Here is a superfast implementation of rANS: https://github.com/jkbonfield/rans_static

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