I see the value in the author's mission to create a replacement for pangrams, but it sounds less like he replaced pangrams (on which I've always been sold as being a tool for content creators to quickly visualize a font with loose approximations of common use cases) and more like he came up with a quicker letterproof. http://famira.com/article/letterproef
Almost like unit testing a font more efficiently rather than using a full letterproof for that process. Which is pretty cool and probably fills a need, though maybe not the same need that pangrams address more broadly.
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I'm not an expert on this topic and am prepared to have what I've learned in the last five minutes fact-checked by someone who actually does this for a living.
For a very long time, pangrams were used to demonstrate typefaces because they were the shortest string that included every letter. I think it was perceptive of him to realize that they weren't optimized for showing letters in their typical settings.
Almost like unit testing a font more efficiently rather than using a full letterproof for that process. Which is pretty cool and probably fills a need, though maybe not the same need that pangrams address more broadly.
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I'm not an expert on this topic and am prepared to have what I've learned in the last five minutes fact-checked by someone who actually does this for a living.