Product Decisions This Supports

Architecture standardization: Adopting the #east philosophy (immutable/fluent methods) across services to improve testability, reduce side effects, and enforce consistency—especially for value objects and service layers.
Build vs. buy: Instead of building custom PSR-compliant streaming (SSE/chunked) and HTTP message abstractions, use this as a foundation. It saves time on standard interfaces and Symfony integration.
Roadmap acceleration: For features requiring real-time server push (SSE, chunked responses) or framework-agnostic middleware, this package provides ready-made interfaces and Symfony StreamedResponse factories.
Use cases: API gateways, real-time dashboards, notification systems, middleware pipelines, and any Symfony 6+ app needing PSR-7/15/11 compliance.

When to Consider This Package

Adopt when: You need framework-agnostic, PSR-compliant HTTP messaging and streaming (SSE/chunked) with Symfony 6+ integration; your team values strict typing, high test coverage, and static analysis; you already follow or want to enforce the #east immutability/fluency philosophy.
Look elsewhere when: You are not using Symfony or PSR-11, or you don’t need streaming features; you require a mature, widely adopted library (low stars/dependents indicate early-stage risk); you prefer a full-stack framework over foundational interfaces; or you don’t want to adopt the #east coding style.

Executives: A low-cost, standards-based foundation that can speed up delivery of real-time streaming features and improve code quality through enforced immutability. However, it’s early-stage—pilot in a non-critical service to validate fit and mitigate adoption risk.
Engineering: Provides PSR-compliant interfaces and Symfony integration for streamed responses (SSE/chunked), eliminating boilerplate. It enforces a consistent, testable coding style with 90%+ test coverage and static analysis. We can adopt incrementally, starting with HTTP streaming components.