mail-threading 0.1.1

JWZ email threading (RFC 5256). Reconstruct message threads from References/In-Reply-To headers, with subject fallback for broken clients.
Documentation 
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{
  "name": "empty-input",
  "description": "No messages produce no threads.",
  "spec": {
    "source": "public API contract",
    "url": "https://www.jwz.org/doc/threading.html",
    "behavior": "threading an empty message set is empty"
  },
  "input": [],
  "expected": {
    "threads": []
  }
}