Stop Mixing Up Long IDs with Kotlin Inline Classes
Kotlin inline classes wrap a primitive in a distinct compile-time type without the runtime cost of a regular wrapper class. Here's when they help and where they break down.
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Scala Value Classes: Zero-Cost Domain Wrappers Without the Boxing Traps
Scala value classes (AnyVal) give you type-safe domain wrappers like UserId that usually cost nothing at runtime. Here's the mechanism, a worked example, and where boxing still bites.
scalaOpaque Types vs AnyVal Wrappers for a Cross-Built Scala Library
A library that cross-builds for Scala 2.13 and Scala 3 needs a zero-cost wrapper for identifiers in a hot path, while keeping the public API distinct from the underlying type. Two documented options are Scala 3 opaque type aliases and value classes that extend AnyVal . Opaque types hide their representation outside the defining scope and are erased to the un