Alex Gaynor committed a55ba89

explanatory comment

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         # the C compiler
         self._load(module, 'loading')
-        # build the FFILibrary class and instance
+        # build the FFILibrary class and instance, this is a module subclass
+        # because modules are expected to have usually-constant-attributes and
+        # in PyPy this means the JIT is able to treat attributes as constant,
+        # which we want.
         class FFILibrary(types.ModuleType):
             _cffi_generic_module = module
             _cffi_ffi = self.ffi