Add Python marshal operations - #2719
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Description
Adds client-side Python marshal encode/decode operations for JSON-compatible CPython format 4 values. Byte strings and integers beyond JavaScript's safe range use explicit tagged JSON representations.
The issue suggested the
py-marshalnpm package. It was deliberately not adopted: its last release was in 2020, its reader lacks several values needed here (including arbitrary-size integers, sets, Unicode/ASCII marshal string variants, and modern reference flags), and its NodeBuffer-oriented implementation is unsuitable as a dependable browser-side codec. The new dependency-free codec covers the documented JSON-compatible scope while keeping the operation client-side. It intentionally does not support version-specific Python code objects or other Python-only values that cannot be represented faithfully as JSON.Existing Issue
Closes #1041.
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AI disclosure
This change was created with OpenAI Codex. The implementation, dependency assessment, and tests were generated with its assistance and then validated with CPython 3.14.4 and the full CyberChef test suite.
Test Coverage
Added CPython-generated format 4 fixtures covering null, booleans, integers, floats, strings, byte strings, lists, tuples, sets, and string-keyed dictionaries, plus references and arbitrary-size integer round trips. The fixture-generation command and CPython encoder-fixture assertion are documented in the test file.
Validated with Node.js 24.19.0: 272 Node API tests and 2,285 operation tests passed.