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When specifying default values in schemas or configurations, ensure they match the declared type to prevent validation errors and unpredictable behavior. For object types, use empty objects ({}) not null, undefined, or arrays. For string types that should be empty by default, use empty strings ("") not null. This practice improves type safety and prevents runtime type errors.

// INCORRECT: Type mismatch between declared type and default
{
  "type": "object",
  "description": "Document data as JSON object.",
  "default": [],  // An array default for an object type
}

// CORRECT: Type-consistent defaults
{
  "type": "object",
  "description": "Document data as JSON object.",
  "default": {},  // An object default for an object type
}

// CORRECT: Empty string default for optional string
{
  "type": "string",
  "description": "Optional document ID",
  "default": "",  // Empty string instead of null
}