manlio_perillo:

Today I noticed that there is no instance declaration for NFData, in the uvector package.

The definition is quite simple:

instance NFData a => NFData (UArr a) where -- NOTE: UArr is already strict rnf array = array `seq` ()

but it is important.

In a my program I was using a tuple of two arrays, and plain `seq` did not worked.

Contact the author with a patch :-) -- Don (who thinks NFData should be sorted out and in base)