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Docs/Plazmo

Plazmo is a WASM-like system that's planned for Plunder. Compared to WASM itself, plazmo is much simpler, is designed to support close integration withPLAN code, and has a frozen feature-set.

TODO: discuss design requirements. For example, that calling Plazmo routines from PLAN should have overhead on the same OOM as a normal function call, and not like starting a new process.

TODO: discuss finalized design decisions. For example, why it's better to remove floats, and how removing support for u32 significantly simplifies the design (by removing the type system). Or, how directly supporting PLAN values and calls to PLAN functions makes it possible to eliminate most jets.

TODO: discuss design areas that are not yet finalized. For example:

For example, talk about the trade-offs between supporting handles to PLAN values vs directly supporting managed references as a register type.

For example, should we have handles to heaps and support many heaps, or should there be one heap?
Discuss the encoding of Plazmo routines as PLAN values and talk about the issues with mutual recursion.