Implementing Equality in Ruby - Shopify

What this post added

This post details the fundamental concepts of equality in Ruby, including the different equality operators (#==, #eql?, #equal?, #===) and their implementations. It explains the importance of correctly implementing equality for custom objects, differentiating between entities (identity-based equality) and value objects (attribute-based equality). The post provides code examples for implementing #== for both types, discusses the properties of equality (reflexivity, symmetry, transitivity), and touches upon type coercion and the #to_str method. It also briefly mentions the Ship of Theseus thought experiment in the context of entity identity.