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Optional serde #94

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uncomputable
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Make witness JSON parsing via serde optional. Add a fuzz target for parsing const expressions as values. Update CI to run all fuzz targets in parallel.

Include new fuzz targets. Add a shortcut to check if fuzz tests build.
witness("a") -> witness::A

The new witness expressions look like constants from the namespace
"witness". In the following commits, we will add this very namespace as
an optional part of a Simfony program. This will enable hardcoding
witness data inside the Program, for applications such as the web IDE.

Minimal code changes. Had to update all occurrences of witness
expressions inside example programs.
The set of tracked calls is fixed and never changes, so we can use
Arc<[T]> instead of Vec<T>. The hash map of declared witnesses is still
expensive to clone, though.
Introduce the `serde` feature which enables parsing of witness JSON
files. In the future, witness data will also be able to be provided via
Simfony code. In this case, we don't need serde. The web IDE will not
need serde and will profit from a smaller WASM size by not including
serde.
@uncomputable uncomputable mentioned this pull request Oct 8, 2024
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@apoelstra apoelstra left a comment

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ACK 6f13898 successfully ran local tests

@apoelstra apoelstra merged commit dbfad07 into BlockstreamResearch:master Oct 8, 2024
10 checks passed
@uncomputable uncomputable deleted the 2024-10-optional-serde branch October 8, 2024 22:15
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2 participants