Unchecked casts in public initMemoryView API

[devcrocod]

The public initMemoryView functions in multik-core/src/commonMain/kotlin/org/jetbrains/kotlinx/multik/ndarray/data/MemoryView.kt rely on unchecked casts across every DataType branch:

// MemoryView.kt:1058
@Suppress("UNCHECKED_CAST")
public fun <T> initMemoryView(size: Int, dataType: DataType, init: (Int) -> T): MemoryView<T> {
    val t = when (dataType) {
        DataType.ByteDataType -> MemoryViewByteArray(ByteArray(size, init as (Int) -> Byte))
        // ... 7 more branches, each with an unchecked cast
    }
    return t as MemoryView<T>
}

The same pattern appears in the zero-init overload (MemoryView.kt:1035). The relationship between T and dataType is an unchecked invariant — passing mismatched arguments produces a ClassCastException on the first element access.

This is part of a broader pattern (see also #251 for NDArray.asType). In Kotlin stdlib, such casts are hidden behind @PublishedApi internal with documented invariants; here they sit on the public API surface.

Proposal

• Move the unchecked-cast implementation behind @PublishedApi internal and expose a safe reified overload that derives dataType from T.
• Or: document the T/dataType invariant explicitly and add a debug-time check.
• Audit other public functions for the same pattern.