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he talked about how one of the primary goals/constraints/jobs of the Wasm project is to keep the abstraction-level as _low as possible_ (hence the title of the talk) — while still raising that abstraction-level when it's absolutely necessary, to provide the proper generality over architectures

examples he touched on:

- number of registers is unknown, can't let the producer/compiler control that, have to depend on the VM/JIT
- same for explicit function-addresses; not all architectures share data/code space, not all have function-pointers; have to have function-tables in Wasm instead