What is the difference between #== and #eql? ?

In Ruby, #== and #eql? are two different methods used to compare objects for equality, but they serve different purposes and operate based on different criteria.

The #== method, also known as the equality operator, is the most basic form of equality check in Ruby. It is used to determine if two objects have the same value or not. When you use #==, Ruby compares the values of the objects to see if they are the same, regardless of their types. This method is often overridden in subclasses to provide class-specific meaning for equality. For example, two different String objects with the same content will be considered equal using #==[2].

5 == 5      # => true
5 == '5'    # => false (since one is an integer and the other is a string)

On the other hand, #eql? is a method that is used to determine if two objects have both the same value and the same type. It is a stricter comparison than #== because it requires both operands to be of the same type in addition to having the same content. This method is significant when dealing with hash keys because i...