Microplate Laravel Package

Technical Evaluation

Architecture fit. This package occupies the labware/domain-model layer of a Laravel application: coordinate systems, wells, and microplate sets. The v6.3.0 additions — CoordinateSystem*Well::POSITIONS_COUNT and MicroplateSet*::PLATE_COUNT — indicate the package exposes typed labware variants (star-glob families, likely one class per SBS plate format and coordinate convention) with class-level constants for cardinality. That is a clean, framework-agnostic core with a thin Laravel service-provider/config wrapper, which fits well alongside an application layer that handles persistence, audit, and workflow. From a TPM standpoint, the value is that plate geometry stops being tribal knowledge encoded as magic numbers in our codebase and becomes a vendor-owned, versioned contract.

Integration feasibility. Composer-installable, PSR-4 autoloaded, no expectation of migrations or schema coupling for this release. Adoption cost is near zero: composer require plus pinning ^6.3. The real integration work is not installing it — it is inventorying where our code, fixtures, and validation rules currently hardcode well counts (96, 384, 1536) or plate-set sizes and replacing them with the new constants.

Technical risk. Low for this specific release: purely additive, no removals, no deprecations, no signature changes. Semver-minor is the correct classification. Residual risks are structural rather than release-specific:

• Constants as public API create an implicit compatibility contract; the vendor may not treat them as BC-covered.
• Per-class constants (*Well, *Set*) suggest a class-per-variant design that will grow combinatorially as new plate formats or coordinate systems are added — watch for class explosion in future minors.
• Cardinality constants can mask domain exceptions (e.g. partial plates, non-standard carriers, custom 6/12/24-well formats) if teams treat them as universal truth.

Key questions.

1. What is the supported PHP/Laravel version matrix, and does it align with our upgrade runway?
2. Are these constants considered part of the public, BC-guaranteed API, or implementation detail?
3. Are counts static metadata or derived at runtime from configuration (i.e. can they diverge from actual instantiated objects)?
4. Is there test coverage asserting each constant against its corresponding collection/enumeration?
5. Is there an enum- or value-object-based alternative on the roadmap that would supersede raw constants?
6. Which labware variants are not covered, and what is the vendor's process for adding them?

Integration Approach

Stack fit. Assumes a modern Laravel baseline (PHP 8.1+, Laravel 10/11+). No queue, cache, or storage dependencies implied by these constants; the package should remain safe to load in CLI, HTTP, and job contexts. Confirm it does not register global helpers or facades we would need to alias.

Migration path. Treat as a non-breaking minor upgrade. Constrain to ^6.3 in composer.json, run composer update in a branch, and validate via the existing CI matrix. No data migration, no config republish, no cache-clear ceremony expected beyond a standard config:clear/optimize:clear in deploy.

Compatibility. Backward compatible with all 6.x consumers. Forward compatibility depends on whether we adopt the constants now — doing so is the cheapest possible hedge against a future 7.0 that removes or renames them. Verify no first-party or transitive dependency pins 6.0.x–6.2.x exclusively.

Sequencing.

1. Confirm version matrix and run the upgrade in a branch with the full test suite.
2. Grep the codebase, seeders, factories, and validation rules for hardcoded well/plate counts.
3. Replace those literals with the new constants, one labware family per PR, with a test asserting the constant matches our labware catalog.
4. Add the package and its constants to our dependency-review checklist and architecture notes.
5. Only after that, consider surfacing counts in API resources or UI configuration so downstream consumers stop hardcoding them too.

Operational Impact

Maintenance. Negligible ongoing burden; minor releases of this shape require only dependency-bot handling and a changelog read. Budget a small recurring effort for tracking the vendor's release cadence and for re-running the constant-vs-catalog assertion when new plate variants ship.

Support. Changelog follows a Keep-a-Changelog-style structure with clear Added/Changed/Fixed sections, which is a good signal for maintainer discipline. Escalation path is community/vendor support rather than a commercial SLA — acceptable for a domain-model package, but it means we own the fallback: keep a thin internal adapter layer so a swap or a fork-and-patch is feasible if the package stalls.

Scaling. Constants are compile-time and cost nothing at runtime; no scaling concern. The scaling question is organizational: as more teams consume the package, the constants become a de facto internal standard, and any divergence between the package's model and our lab's actual hardware becomes a cross-team issue rather than a local one. Consider an internal "labware reference" doc that cites the package as the source of truth.

Failure modes.

• Magic-number drift: teams continue hardcoding counts elsewhere; constants add no protection unless enforced in review.
• Over-generalization: applying a standard plate count to a non-standard carrier and silently producing wrong coordinates or volumes.
• Class-family churn: a future minor adds or renames variant classes; code referencing specific *Well/*Set* classes breaks even though the constants are additive.
• Upgrade stalls: an unrelated dependency blocks the 6.x floor, pinning us below 6.3 and creating a two-tier codebase.
• Silent autoload/config issues after deploy if opcache or config caching is not refreshed — standard Laravel deploy hygiene, but worth a checklist item.

Ramp-up. Very low. New engineers otherwise need domain context on plate formats and coordinate conventions; these constants, plus a short internal note, compress that ramp-up meaningfully. Onboarding material should point at the constants rather than restating the numbers.

TPM recommendation. Adopt v6.3.0. It is additive, low-risk, and its main value is as an enabler for removing hardcoded labware geometry from our codebase — the constants themselves are trivial, but the discipline they invite is not. Track the vendor's roadmap for an enum-based API and for class-family growth, and re-evaluate the package at the next major.