[jkrenge]

Superseded by consolidated postal geocoding PR #124. This PR's head commit is retained in the combined branch. Combined CI passes on Node.js 24/26 and static checks.

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Summary

DNK currently has no postal geocoding. Add 1,159 full four-digit postal points from GeoNames DK.zip, retrieved 2026-11-04 (export modified 2026-11-04), under CC BY 4.0 with attribution and source hash in docs/geocode-DNK.md.

coordinates(DNK, postcode)
  trim outer whitespace and optional DK-/DK prefix
  exact postcode lookup → [longitude, latitude] strings

All 1,159 source rows are unique, so no aggregation is needed. Points are approximate; coverage is not proven complete and 122 source accuracy fields are empty. Municipal checks confirm Ærøskøbing and Skagen postcode/locality pairs, not exact centroid positions. No distance error bound is claimed.

Evidence

• Before: DNK returns undefined as an unsupported country.
• After: 1050, DK-1050, dk1050, and outer whitespace resolve to ['12.5857', '55.6806']; unknown and malformed codes return undefined.
• All 98 tests pass, including full dataset lookup, unique codes, finite/range validation, islands, and unknown codes.
• npm run lint, npm run format:check, and npm run validate:data pass. The validator retains two existing AUT/BEL warnings.

Merge Danger

Door: two-way

Blast Radius: DNK

No region mappings or lib/region.js changes. Other-country normalization and string coordinate return types stay unchanged. lib/geocode.js overlaps concurrent country PRs; preserve their allowlist additions when resolving conflicts. No merge, publication, or deployment is part of this PR.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-04T22:19:01.818138Z	8ed3d30	PR opened

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