Check if all elements in an array are Fixnum

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Problem Statement

Given an array, return true if all the elements are Fixnums.

You need to write array_of_fixnums? method to accomplish this task.

Given [1,2,3], the method should return true


You might want to use Enumerable#all?, more information regarding the method can be found here

You might want to read up on Ruby classes as well, more information can be found here

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