whose size is set by the first one to be created (or the static
``Resolver.configure`` method).
* `.ExecutorResolver` is now documented for public use.
+* `.bind_sockets` now works in configurations with incomplete IPv6 support.
`tornado.options`
~~~~~~~~~~~~~~~~~
`.OptionParser.group_dict` returns all options with a given group
name, and `.OptionParser.as_dict` returns all options.
+`tornado.process`
+~~~~~~~~~~~~~~~~~
+
+* `tornado.process.Subprocess` no longer leaks file descriptors into
+ the child process, which fixes a problem in which the child could not
+ detect that the parent process had closed its stdin pipe.
+* `.Subprocess.set_exit_callback` now works for subprocesses created
+ without an explicit ``io_loop`` parameter.
+
`tornado.stack_context`
~~~~~~~~~~~~~~~~~~~~~~~