If you read the Wikipedia page for Inline Caching, you might think that inline caches are caches, in the same way that you might talk about a processor cache, or a page cache for a webserver like memcached. The funny thing is, that really undersells how they're used in SpiderMonkey (and I believe other JS engines), and in hindsight I really wish I had known more about them years ago. The Wikipedia page cites a paper L. Peter Deutsch, Allan M. Schiffman, "Efficient implementation of the Smalltalk...