Revert "Add BufferState enum replacing magic buffer values (-1, -2, null, array)"

This reverts commit 8b2a2a5.

Signed-off-by: Simon Mundy <simon.mundy@peptolab.com>

Author: simon-mundy

phpstan.neon.dist

@@ -1,7 +1,7 @@
 includes:
     - phpstan-baseline.neon
 parameters:
-    level: 8
+    level: 4
     paths:
         - src
         - test
@@ -16,4 +16,4 @@ parameters:
         - stubs/Laminas/ServiceManager/Factory/InvokableFactory.stub
         - stubs/Laminas/ServiceManager/Initializer/InitializerInterface.stub
         - stubs/Psr/Container/ContainerInterface.stub
-    treatPhpDocTypesAsCertain: false
+    treatPhpDocTypesAsCertain: false