There are no major changes between 2.4b1 and 2.4.0.

Notable fixes and improvements

• The documentation is now generated properly and with the correct version identifier.
• Automatic cursor changes are now only enabled on the subset of XTerm versions known to support them, resolving a problem where older versions printed garbage to the terminal before and after every prompt (#3499).
• Improved the title set in Apple Terminal.app.
• Added completions for defaults and improved completions for diskutil (#3478).