Scala-Perl Cross-Validation Uses Shared JSON Intermediate Representation

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Developers building the Siunertaq system faced a common polyglot challenge: verifying that a Scala stack machine and a Perl runtime produce identical results. Rather than generating Perl code directly from Scala instructions — an approach that produced brittle, text-based tests — the team adopted a shared JSON intermediate representation. The same JSON format already used to store stack instructions in PostgreSQL was extended to serve as a universal contract consumed by three systems: a JVM evaluator, a Perl runtime, and a ClickHouse analytics pipeline. A lightweight Perl module of around 80 lines, requiring no external dependencies, parses and executes the shared JSON, keeping the generated scripts minimal. This architecture allows both runtimes to be tested against identical instruction sets, making cross-validation structural rather than textual.

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