misc_form: Any document with user-fillable fields issued by a government body for tax-related purposes that does not match one of the specific classification types listed above. This includes forms that supplement other forms. If a page has a government-issued form identifier and user-fillable fields, it should always be classified as misc_form regardless of its role in the return. The type field must always be exactly "misc_form" with no additional text or numbers.
Identifier: The actual identifier of the form (e.g., W-2, 1099-B, IL-Schedule_M).