[PEP 451] Don't change the signature of the file-based finders.

The "Open Issues" section is also cleaned up.

pep-0451.txt

@@ -278,8 +278,9 @@ finders.  See the `Factory Functions`_ section below for more detail.
 
 * spec_from_file_location(name, location, \*, loader=None, submodule_search_locations=None)
   - build a spec from file-oriented information and loader APIs.
-* from_loader(name, loader, \*, origin=None, is_package=None) - build
-  a spec with missing information filled in by using loader APIs.
+* spec_from_loader(name, loader, \*, origin=None, is_package=None)
+  - build a spec with missing information filled in by using loader
+  APIs.
 
 Other API Additions
 -------------------
@@ -313,8 +314,6 @@ Deprecations
 * importlib.abc.PathEntryFinder.find_loader()
 * importlib.abc.Loader.load_module()
 * importlib.abc.Loader.module_repr()
-* The parameters and attributes of the various loaders in
-  importlib.machinery
 * importlib.util.set_package()
 * importlib.util.set_loader()
 * importlib.find_loader()
@@ -756,12 +755,6 @@ though the same information is found on ModuleSpec.  ModuleSpec
 can use it to populate its own is_package if that information is
 not otherwise available.  Still, it will be made optional.
 
-One consequence of ModuleSpec is that loader ``__init__`` methods will
-no longer need to accommodate per-module state.  The path-based loaders
-in importlib take arguments in their ``__init__()`` and have
-corresponding attributes.  However, the need for those values is
-eliminated by module specs.
-
 In addition to executing a module during loading, loaders will still be
 directly responsible for providing APIs concerning module-related data.
 
@@ -775,11 +768,10 @@ Other Changes
   was started.  For instance, with ``-m`` the spec's name will be that
   of the run module, while ``__main__.__name__`` will still be
   "__main__".
-* We add importlib.find_spec() to mirror
-  importlib.find_loader() (which becomes deprecated).
+* We will add importlib.find_spec() to mirror importlib.find_loader()
+  (which becomes deprecated).
 * importlib.reload() is changed to use ModuleSpec.load().
-* importlib.reload() will now make use of the per-module import
-  lock.
+* importlib.reload() will now make use of the per-module import lock.
 
 
 Reference Implementation
@@ -792,10 +784,19 @@ http://bugs.python.org/issue18864.
 Open Issues
 ==============
 
-\* The impact of this change on pkgutil (and setuptools) needs looking
-into.  It has some generic function-based extensions to PEP 302.  These
-may break if importlib starts wrapping loaders without the tools'
-knowledge.
+\* Impact on some kinds of lazy loading modules. [lazy_import_concerns]_
+
+This should not be an issue since the PEP does not change the semantics
+of this behavior.
+
+
+Implementation Notes
+====================
+
+\* The implementation of this PEP needs to be cognizant of its impact on
+pkgutil (and setuptools).  pkgutil has some generic function-based
+extensions to PEP 302 which may break if importlib starts wrapping
+loaders without the tools' knowledge.
 
 \* Other modules to look at: runpy (and pythonrun.c), pickle, pydoc,
 inspect.
@@ -803,8 +804,6 @@ inspect.
 For instance, pickle should be updated in the ``__main__`` case to look
 at ``module.__spec__.name``.
 
-\* Impact on some kinds of lazy loading modules. [lazy_import_concerns]_
-
 
 References
 ==========