default services conflit ?

old.vendor/psr/cache/README.md

@@ -0,0 +1,9 @@
+PSR Cache
+=========
+
+This repository holds all interfaces defined by
+[PSR-6](http://www.php-fig.org/psr/psr-6/).
+
+Note that this is not a Cache implementation of its own. It is merely an
+interface that describes a Cache implementation. See the specification for more 
+details.