[Stream]

Documented why new `StreamInterface` exists

Author: cboden

StreamInterface.php

@@ -4,6 +4,9 @@
 
 use Evenement\EventEmitterInterface;
 
+// This class exists because ReadableStreamInterface and WritableStreamInterface
+//  both need close methods.
+// In PHP <= 5.3.8 a class can not implement 2 interfaces with coincidental matching methods
 interface StreamInterface extends EventEmitterInterface
 {
     public function close();