[Alexandre-T]

Closes #12.

GeoJsonStrategy now encodes Geometry and Geography MultiLineStrings in XY and XYZ, preserving every line, position, member order and Z value. An aggregate with no members emits an empty coordinates array; any EMPTY or singleton LineString member throws UnsupportedGeometryStructureException before JSON is returned.

The implementation adds one private encoder using the existing model coordinate arrays and shared dimension, interface and JSON exception contracts. SRID/reference metadata remains omitted, measured dimensions remain rejected including EMPTY, and antimeridian crossings are preserved unchanged. No new public symbols, dependencies, architecture changes or breaking changes are introduced; the approved Story contracts apply.

RFC 7946 sections 3.1.4–3.1.5 define line and MultiLineString coordinate structure. The approved EMPTY policy and deliberate non-application of antimeridian cutting in section 3.1.9 are documented in docs/strategies.md, with usage and caller responsibilities. Other geometry contributions remain out of scope.

Validation:

• vendor/bin/phpunit --no-coverage --filter 'MultiLineStringTest|ExceptionContractTest': 56 tests, 185 assertions passed.
• composer test: 876 tests, 1355 assertions passed on PHP 8.4.25 with PCOV.
• composer quality: passed (PHP CS Fixer, PHPStan level 9, PHPMD and PHP_CodeSniffer). Existing PHPMD/PDepend dependencies emit PHP 8.4 deprecation notices without violations.
• git diff --check: passed.

GeometryMultiLineStringTest and GeographyMultiLineStringTest cover concrete XY/XYZ examples, empty aggregates, EMPTY first/last/all members, singleton members, measured inputs, order, reference metadata and antimeridian crossings. ExceptionContractTest covers JSON failure chaining using a model-supported non-finite coordinate and preserves the internal interface exception contract.

Independent review and CI remain required before the Product Owner's merge decision. No unresolved implementation gate was identified.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4340529) to head (64acd24).

Additional details and impacted files

@@             Coverage Diff             @@
##                main       #21   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       156       161    +5     
===========================================
  Files             14        14           
  Lines            287       296    +9     
===========================================
+ Hits             287       296    +9     

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[Alexandre-T]

READY FOR MERGE — PR #21, commit 64acd24.

No blocking findings or unresolved Gates.

• All six criteria from Story: Encode MultiLineString geometries as GeoJSON #12 and the shared criteria are satisfied: Geometry/Geography families, XY/XYZ, EMPTY, XYM/XYZM rejection, ordering, Z, references, exceptions, and antimeridian handling.
• Structure verified against RFC 7946 §§3.1.4–3.1.5. The EMPTY and antimeridian policies follow the approved and documented decisions.
• Changes are limited to the existing strategy, with no additional dependencies, migrations, or breaking changes. English documentation is complete.
• Independent checks: composer test passed with 876 tests / 1,355 assertions; composer quality and git diff --check also passed. Dependency deprecation notices from PHPMD/PDepend are present, with no violations.
• Both CI workflows for the commit passed; the workspace is clean and HEAD is unchanged.

The applicable Definition of Done requirements prior to merge are satisfied. No GitHub review has been published and no merge has been performed. The merge decision and final post-merge verification are still required; the Story is not declared Done.