rspec/rules/S2933/why.adoc

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== Why is this an issue?
`readonly` fields can only be assigned in a class constructor. If a class has a field that's not marked `readonly` but is only set in the constructor, it could cause confusion about the field's intended use. To avoid confusion, such fields should be marked `readonly` to make their intended use explicit, and to prevent future maintainers from inadvertently changing their use.