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Escaping Boolean hell and making Illegal States Unrepresentable in Scala 2.13

A sealed trait removes impossible states from a model, but five details decide whether it holds: constructors, exhaustivity warnings, wildcards, Scala 2 inference and secrets in toString. I compiled each one on Scala 2.13.18.

17 Oct 2026 · 8 min read ·88 views

#adt
#domain-modeling
#pattern-matching
#scala
#scala-play
#sealed-trait