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Ruby » Language Basics » Constants 
1.Constants in Ruby start with an uppercase letter
2.Ruby allows you to change the values in constants by assigning a new value to them:
3.Change the value of Pi, it'll let you do it, but you'll get a warning:
4.The Scope of Constants
5.Constants are defined within the scope of the current class and are made available to all child classes, unless they're overridden:
6.Array constant
7.freeze does nothing since Fixnums are already immutable.
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