#272 - scalar type hints, return type hints, strict types

UPGRADE.md

@@ -8,6 +8,12 @@ This is a list of backwards compatibility (BC) breaks introduced in ProxyManager
 
  * PHP `~7.0` is now required to use ProxyManager
  * HHVM compatibility is not guaranteed, as HHVM is not yet PHP 7 compliant
+ * All classes and interfaces now use [strict scalar type hints](http://php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration).
+   If you extended or implemented anything from the `ProxyManager\` namespace, you probably need to change
+   that code to adapt it to the new signature.
+ * All classes and interfaces now use [return type declarations](http://php.net/manual/en/functions.returning-values.php#functions.returning-values.type-declaration).
+   If you extended or implemented anything from the `ProxyManager\` namespace, you probably need to change
+   that code to adapt it to the new signature.
  * ProxyManager will no longer write proxies to disk by default:
    the [`EvaluatingGeneratorStrategy`](src/GeneratorStrategy/EvaluatingGeneratorStrategy.php) is used instead.
    If you still want ProxyManager to write files to disk, please refer to the [tuning for production docs](docs/tuning-for-production.md)