Release 1.18.0

1.18.0 (2026-10-12)

Changed

• Failure reasons (#506): METADATA.regexp of 14
  computed-checksum classes (AUS Medicare Number and Tax File Number, BGR Unified Identification Code, CHL National
  Unique Role Number, COL Unique Personal ID, GRC Tax Identity Number, HKG Hong Kong Identity Card Number, IRN National
  ID Number, ISR Identity Number, JPN My Number, LVA Personal Code, TUR National ID Number, UKR Legal Entity ID Number
  and Taxpayer ID Number) now names the check character(s) with a checksum group, so failure_reason() reports
  checksum_mismatch instead of validation_failed for a definite check-character mismatch. The unified
  validate() and parse_id_info() report it too for the nine classes that are their country's primary ID (CHL, COL,
  HKG, IRN, ISR, JPN, LVA, TUR and the UKR Taxpayer ID Number); they select only the primary ID, so the other five
  (AUS Medicare Number and Tax File Number, BGR Unified Identification Code, GRC Tax Identity Number and UKR Legal
  Entity ID Number) are reached through failure_reason(id_class, number). Accepted and rejected inputs, parsed
  results and checksum() values are unchanged. The Australian tax file number's checksum() returns a remainder
  rather than a check digit, so a remainder equal to the last digit keeps the generic reason.

Other fixes

• Parity sync script (#564): construct failed-rollback reports
  before bytecode cleanup and test that a failed restore after KeyboardInterrupt or SystemExit reports both errors
  and the tracked paths with exit code 2; successful rollback still propagates the original interrupt.
• Registry tests (#566): exercise every slow key lookup path
  in the concurrency helper and check the portable non-iterable alias error fragment without changing registry behavior.
• Release tests (#559): cover rejection of a bare
  mismatched-version dist-info entry and an absolute package path in wheels; release guard behavior is unchanged.

Documentation

• Contributor guide (#551): AGENTS.md documents the
  120-column line-length convention and its exceptions (whole URLs on their own line, Markdown tables and generated
  guides); the 1.17.0 DOM entry now uses python-stdnum's own wording.
• Contributor guide (#561): specify that the re-export
  exemption applies to from .util import ..., not from . import util; only the rule's wording changes.
• Display format (#557): clarify that capital-letter field
  names are outside {...} and D usually denotes a day, with widths and meanings defined per class; formats and
  validity are unchanged.
• EGY national ID number (#555): distinguish the Node
  sister project's reported Luhn failure from its unproven weighted mod-11 hypothesis in the docstring; the research
  note is not an official source, and validity is unchanged.
• Mask vocabulary (#570): explain Sweden's retained +
  exception to slot-count matching, with a synthetic layout example; preferred input-mask patterns still use literal
  -, and formatting behavior is unchanged.
• Unified API tests (#568): document the hostile
  representation helpers with class docstrings; test behavior is unchanged.