Actual Behavior

Package does provide only php-http/client-implementation

Expected Behavior

Package should also provide psr/http-client-implementation if fully compatible with PSR-18

Steps to Reproduce

Create a project with composer.json:

...
"require": {
        "psr/http-client": "^1.0.0",
        "psr/http-client-implementation": "^1.0.0",
        "psr/http-message": "^1.0.0",
        "psr/http-message-implementation": "^1.0.0",
        "psr/http-factory": "^1.0.0",
        "psr/http-factory-implementation": "^1.0.0",
},
"require-dev": {
        "phpunit/phpunit": "^6.0.0",
        "nyholm/psr7": "^1.0.0",
        "php-http/mock-client": "^1.2.0"
},
...

Composer install/update will fail with Your requirements could not be resolved to an installable set of packages. where it would succeed if I'd require php-http/client-implementation instead.

Possible Solutions

Add psr/http-client-implementation to composer.json provides section.