Feature/map #203
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Feature/map #203
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Start out simple. Assume we cannot return another defer from the defer we already got. This makes for a relatively simple update to the code base, where the result of a field closure applies the chain of functions before it works with the result at a deeper level.
Strategy: keep a chain of changes. Apply this chain when we have value resolution. Do not cope with the chain dumping a defer for now, but it is doable given the closure handler anyway. It has to work with the possibility that the upstream ref changes anyway, so it should be sound to make this change on top.
Strategy: When a chain returns a defer in the middle, build a new field closure using the standard closure building tooling. Then ask the upstream to change its reference to this new closure. Also graft the completion chain on top of the chain we got from the newly formed closure.
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