What is the most special aspect of nil?

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Question:What is the most special aspect of nil?

1.This maps requests for the URL /pages/home to the home action in the Pages controller.

2.A controller is a container for a group of (possibly dynamic) web pages.

3.When the order matters, use an array.

4.Other than the object "false" itself, nil is the only object that defaults to false.

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  1. What is the most special aspect of nil?
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