Go Modernize

Go evolves. Code written for Go 1.16 should not look the same as code targeting Go 1.22+. Modernize incrementally — update go.mod, then adopt new patterns.

1. Generics (Go 1.18+)

Replace interface{} / any with type parameters where appropriate:

// ❌ Before — loses type safety
func Contains(slice []interface{}, target interface{}) bool {
    for _, v := range slice {
        if v == target {
            return true
        }
    }
    return false
}