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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{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/planetaryescape/mxr/crates/mail-threading/testdata/schema.json",
  "title": "mail-threading conformance fixture",
  "type": "object",
  "required": ["name", "description", "spec", "input", "expected"],
  "additionalProperties": false,
  "properties": {
    "name": { "type": "string", "minLength": 1 },
    "description": { "type": "string", "minLength": 1 },
    "spec": {
      "type": "object",
      "required": ["source", "url", "behavior"],
      "additionalProperties": false,
      "properties": {
        "source": { "type": "string", "minLength": 1 },
        "url": { "type": "string", "format": "uri" },
        "behavior": { "type": "string", "minLength": 1 }
      }
    },
    "options": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "subject_merge": { "type": "boolean" },
        "prune_phantoms": { "type": "boolean" },
        "subject_prefixes": {
          "type": "array",
          "items": { "type": "string", "minLength": 1 }
        }
      }
    },
    "input": {
      "type": "array",
      "items": { "$ref": "#/$defs/message" }
    },
    "expected": {
      "type": "object",
      "required": ["threads"],
      "additionalProperties": false,
      "properties": {
        "threads": {
          "type": "array",
          "items": { "$ref": "#/$defs/thread" }
        }
      }
    }
  },
  "$defs": {
    "message": {
      "type": "object",
      "required": ["id", "message_id", "references", "subject", "date"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "message_id": {
          "anyOf": [
            { "type": "string", "minLength": 1 },
            { "type": "null" }
          ]
        },
        "in_reply_to": { "type": ["string", "null"] },
        "references": {
          "type": "array",
          "items": { "type": "string", "minLength": 1 }
        },
        "subject": { "type": "string" },
        "date": { "type": "string", "format": "date-time" }
      }
    },
    "thread": {
      "type": "object",
      "required": ["root", "messages"],
      "additionalProperties": false,
      "properties": {
        "root": { "type": "string", "minLength": 1 },
        "messages": {
          "type": "array",
          "items": { "type": "string", "minLength": 1 }
        }
      }
    }
  }
}