Except that right now you are limited to arithmetic and typed array manipulation. Subset like that is predictable because it is taking away all moving dynamic

Except that right now you are limited to arithmetic and typed array manipulation. Subset like that is predictable because it is taking away all moving dynamic parts. You become free from questions like "where should I put methods? on prototype or on object itself?" not because you have an answer now, but because you can't have objects, prototypes and methods :-) [well you can but you have to emulate them with typed arrays and virtual dispatch tables, it is likely be slower than "native" JS method dispatch].