SPEC in rack-1.1.6 vs SPEC in rack-1.2.0

@@ -9,12 +9,12 @@
 and returns an Array of exactly three values:
 The *status*,
 the *headers*,
 and the *body*.
 == The Environment
-The environment must be an true instance of Hash (no
-subclassing allowed) that includes CGI-like headers.
-The application is free to modify the environment.
+The environment must be an instance of Hash that includes
+CGI-like headers.  The application is free to modify the
+environment.
 The environment is required to include these variables
 (adopted from PEP333), except when they'd be empty, but see
 below.
 <tt>REQUEST_METHOD</tt>:: The HTTP request method, such as
                           "GET" or "POST". This cannot ever