One remarkable aspect of the JS packaging ecosystem is that people package individual functions. For example, lodash.sortby: https://www.npmjs.com/package/lodash.sortby
It shows how lightweight the packaging process is. I've not seen this happen in other ecosystems.
miniblog.
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I would have thought that invoking a C compiler would be a solved problem. Looking at Rust's cc crate there's a remarkable long tail of corner cases to fix.
Exotic CPUs, microarchitectures, compiler differences, operating system differences, etc.
Smalltalk has a remarkable method named #become: that allows you to modify all pointers to a given object to point to a different object!
https://gbracha.blogspot.com/2009/07/miracle-of-become.html
This goes even further than updating instances when a class changes, it's changing instance references.
On the remarkable inertia of database and programming language choices early in the life of a company: