in src/main/java/org/apache/datasketches/memory/internal/WritableMemoryImpl.java [249:254]
public WritableMemory writableRegion(final long offsetBytes, final long capacityBytes, final ByteOrder byteOrder) {
if (this.isReadOnly()) {
throw new IllegalArgumentException("Cannot create a writable region from a read-only Memory.");
}
return regionImpl(offsetBytes, capacityBytes, false, byteOrder);
}