// Write the share but only if the given value is a Just.
// If it is None, pretend that the value was written
-write` :: (sds m p r w) p (m (? w)) -> PViewT m (WriteResult m p r w) | TC w & Monad m & write sds
+write` :: (sds m p r w) p (m (? w)) -> PViewT m (WriteResult m p r w) | TC w & Monad m & write sds & TC p
write` sds p mmv = liftT mmv >>= \mv->case mv of
?None = liftT $ pure $ Written ()
?Just v = write sds p v
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