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Low-bit tagging is a technique where the low bits of values are used to store type information. There are numerous benefits that come with this technique and it is quite popular in implementations of Scheme, JavaScript and other languages. But once you start down the road of bit-twiddling it is hard to stop and the design of the tagging system may become difficult to understand. So that’s when you look in your tool box and pull out something like Z3, which this article explores.

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InPhase asked today on #scheme about the R7RS vs R6RS debate. I followed the original debate closely and have experience both using and implementing R6RS. I also recently added R7RS support in Akku.scm 0.3.0, so I feel like I can weigh in on this. It’s a topic that many feel passionately about, and I’m also firmly on one side of the debate, but I will try to keep my own opinions and hyperbole out of it this time.

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I have made some strides with Akku.scm since the introductory blog article and the announcement on the Chez Scheme mailing list. The big feature on the horizon is support for translating R7RS libraries to run on R6RS.

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I previously wrote about an AI for the Columns game. It was actually not written for the web to start with, but for a set of NeoPixel displays. Now I have fixed it up a little, made the code public and even have a picture to show.

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