nextChildOrNull

Use an explicit iterator()

Exception-free version of nextChild

Using decodeRethrowing:

val result = structure.decodeRethrowing {
    val child = nextOrNull()
    // ...
    DecodedStructure(...)
}

Manual iteration:

val iterator = structure.iterator()
while (iterator.hasNext()) {
    val child = iterator.nextOrNull()
    // Process child
}