I've been reading about the object-capability model as seen in the E programming language.
It reminds me of dependency injection, but used pervasively. Rather than calling static methods, you pass in object arguments and call methods in them.
miniblog.
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I like the notion of "pac-man complete", the idea that your programming language needs enough effects/IO to do a 2D game: https://prog21.dadgum.com/23.html
We should have more levels of language capability. 'Can do Hello World' and 'can do fizzbuzz' are useful for a new language.