- The "output encoding" now defaults
  to "ascii", whereas previously
  it was set to None.  This has the effect
  of FastEncodingBuffer being used internally
  by default when render() is called, instead
  of cStringIO or StringIO, which are
  slower, but allow bytestrings with
  unknown encoding to pass right through.
  It is of course not recommended to use
  bytestrings of unknown encoding. Usage of
  the "disable_unicode" mode also requires
  that output_encoding be set to None.

  '' write in the case of backslash-ended
  lines.  [ticket:155]

  is delayed until actually needed;
  this to remove the performance penalty
  from startup, particularly for
  "single execution" environments
  such as shell scripts. [ticket:153]

  setup.py instead of "install_requires".
  This to produce a lighter weight install
  for those who don't use the caching
  as well as to conform to Pyramid
  deployment practices.  [ticket:154]

  setup.py which prevented setup.py
  from running 2to3 on install.
  [ticket:148]

  are considered "undefined", meaning they
  are pulled from the context, has been
  trimmed back to not include variables
  declared inside of expressions (i.e. from
  list comprehensions), as well as
  in the argument list of lambdas.  This
  to better support the strict_undefined
  feature.

  strict_undefined=True, will cause
  variables not found in the context to
  raise a NameError immediately, instead of
  defaulting to the UNDEFINED value.

  This to support GAE which can't run markupsafe.
  [ticket:151] No idea whatsoever if the
  install_requires in setup.py also breaks GAE,
  couldn't get an answer on this.

  such as <%foo:bar x="${...}">, now
  allow multiline Python expressions.

  for the `file` argument, i.e. with ${}.
  The `context` variable, if needed,
  must be referenced explicitly.
  [ticket:141]

- Fixed previously non-covered regular
  expression, such that using a ${} expression
  inside of a tag element that doesn't allow
  them raises a CompileException instead of
  silently failing.

  i.e. in place of cgi.escape().  Faster
  C-based implementation and also escapes
  single quotes for additional security.
  Supports the __html__ attribute for
  the given expression as well.

  When using "disable_unicode" mode,
  a pure Python HTML escaper function
  is used which also quotes single quotes.

  Note that Pylons by default doesn't
  use Mako's filter - check your
  environment.py file.

  exceptions.text_error_template which
  is not Py3k compatible.  [ticket:137]

  such that if no traceback is passed
  and sys.exc_info() has been reset,
  the formatter just returns blank
  for the "traceback" portion.
  [ticket:135]
- some long line cleanup

  where the source is stored temporarily is
  now made in the same directory as that of
  the .py file.  This ensures that the two
  files share the same filesystem, thus
  avoiding cross-filesystem synchronization
  issues.  Thanks to Charles Cazabon.

  line contains no line number, as in when
  inside an eval/exec-generated function.
  [ticket:132]

  template.last_modified

  exc.__class__.__name__
  in html/text error templates when using
  Python 2.4 [ticket:131]

  template.get_def(...).render() now checks the
  argument signature the same way as it did in
  0.2.5, so that TypeError is not raised.
  reopen of [ticket:116]

  [ticket:129]

  a given path that is a directory, not a filename,
  instead of passing through to the template to
  generate IOError.  [ticket:73]

  is passed only an absolute filename (i.e. with c:
  drive etc.)  and no URI - the URI is converted
  to a forward-slash path and module_directory
  is treated as a windows path.  [ticket:128]

  uncommon feature, have been improved.  The defs
  no longer get doubly-rendered in the body() scope,
  and now allow local variable assignment without
  breakage.  [ticket:109]

  inheriting template - the full set of render()
  arguments are passed down through the inherits
  chain.  Undeclared arguments go into **pageargs
  as usual.  [ticket:116]

  % if: %endif, etc. [ticket:94]
- finished cleanup for codegen.py, [ticket:98]

  non-whitespace character on a line by escaping
  it as in "%%". [ticket:112]

  text_error_template().render() now accept "error"
  and "traceback" as optional arguments, and
  these are now actually used.  [ticket:122]

- Python 3 support is added ! See README.py3k
  for installation and testing notes.
  [ticket:119]

- Source code escaping has been simplified.
  In particular, module source files are now
  generated with the Python "magic encoding
  comment", and source code is passed through
  mostly unescaped, except for that code which
  is regenerated from parsed Python source.
  This fixes usage of unicode in
  <%namespace:defname> tags.  [ticket:99]

- start work on #98

html_error_template. fixes #88

cases

fixes #118

  the base module.  [ticket:110]

  was causing tags to compile with
  case-insensitive names, thus messing up
  custom <%call> names. [ticket:108]

  to store templates, it uses the more
  permissive mode of 0775 instead of 0750,
  helping out with certain multi-process
  scenarios. Note that the mode is always
  subject to the restrictions of the existing
  umask. [ticket:101]

  AttributeError on attribute not found
  instead of RuntimeError.  [ticket:104]

  allows custom decoration functions to wrap
  rendering callables.  Mainly intended for
  custom caching algorithms, not sure what
  other uses there may be (but there may be).
  Examples are in the "filtering" docs.