Zero-Cost Types? The Fine Print on Kotlin Value Classes

<blockquote> <p><em>Compose’s own</em> <code>Dp</code><em>,</em> <code>Color</code> <em>and</em> <code>TextUnit</code> <em>are value classes. Here's why.</em></p> </blockquote> <p><code>@JvmInline value class ShipmentId(val raw: String)</code> reads like a free upgrade: a real type in the source, a plain <code>String</code> at runtime. Most of the time that is exactly what you get. Sometimes the c

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