CommonMark Specification and Test Cases

The `commonmark-spec` package provides the official CommonMark specification (`spec.txt`) and a comprehensive suite of over 500 conformance test cases in a machine-readable JSON format. It is a crucial resource for developers building or testing Markdown parsers and renderers that aim for CommonMark compatibility. This package primarily serves as a data source, not a Markdown processor itself; for implementations, refer to `commonmark.js` (JavaScript) or `cmark` (C). The current stable version is 0.31.2, released January 28, 2024. Releases generally occur with updates to the CommonMark specification, which includes clarifications, corrections, and sometimes minor syntactic adjustments. The package's core differentiator is its direct provision of the authoritative spec and its associated, extensive test suite, making it the definitive reference for CommonMark conformance testing.