IOperationResult<T> Upsert<T>(
	string key,
	T value,
	ulong cas,
	uint expiration
)

Function Upsert(Of T) ( 
	key As String,
	value As T,
	cas As ULong,
	expiration As UInteger
) As IOperationResult(Of T)

generic<typename T>
IOperationResult<T>^ Upsert(
	String^ key, 
	T value, 
	unsigned long long cas, 
	unsigned int expiration
)

abstract Upsert : 
        key : string * 
        value : 'T * 
        cas : uint64 * 
        expiration : uint32 -> IOperationResult<'T>