API changes between v0.4 and v0.6

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Changed:

• The customFds option to the child_process.spawn method is deprecated.
• You can no longer send a file descriptor through a unix pipe. Instead you can send a handle via child_process.fork.
• fs.symlink takes an optional mode argument, which can either be 'dir' or 'file'. The default is 'file'. This argument is only needed for Windows (it's ignored on other platforms).
• http.Agent.appendMessage was removed.
• The require.paths have been removed (use NODE_PATH environment variable instead).
• C++ node::EventEmitter has been removed. Instead use node::MakeCallback()

Added:

• zlib module http://nodejs.org/docs/v0.5.9/api/zlib.html
• child_process.fork
• fs.watch
• assert(val) as a shorthand for assert.ok(val)
• process.arch, os.arch()