Extract early changes from PR 4136 #4190
Merged
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Most of the marshal and store level changes from #4136 seem ready to merge into master, and would help with other things I want to do. In particular, it gives us the basic pattern language, as well as the basic in-memory ephemeral stores. The kernel mods from #4136 are omitted, and therefore also the new support for virtual or durable stores.
Also omitted are the draft documentation pages even for marshal and store levels, as these have not yet been updated to explain the current semantics accurately.
All omitted elements from #4136 are expected to arrive in later PRs, unless stated otherwise.