Also being able to remove all the dispatch and stack-allocate everything. Haskell would probably do a good job of that too but in python or js, even with codege

Also being able to remove all the dispatch and stack-allocate everything. Haskell would probably do a good job of that too but in python or js, even with codegen, it would be hard to avoid heap allocation. The simple examples here might fall to escape analysis, but in production code the intermediate Blob values typically cross a lot of function boundaries.