Release Notes: This release supports keeping automatically-removed feeble things in the AST, like whitespace or comments.
Release Notes: This maintenance release fixes some small bugs which occurred when Symbol.check_keywords = True and adds the omit() function.
Release Notes: Feature enhancements are provided, like a method for memory cache clearing and improving composing and text representation. Some small bugs are fixed.
Release Notes: This release adds the ability to have class int as grammar, supporting optional attributes in xml2thing() and thing2xml().
Release Notes: Implements a portable way to have new style function declarations without syntax errors in Python 2.7. Extends the synopsis of the csl() function. Minor documentation enhancements. Code cleanup.