*Main> :t Data.Text.IO.readFile
Data.Text.IO.readFile :: FilePath -> IO T.Text

but

*Main> :t Data.Text.Lazy.IO.readFile
Data.Text.Lazy.IO.readFile
  :: FilePath -> IO text-0.7.1.0:Data.Text.Lazy.Internal.Text

why does the lazy version use the internal type, whereas the strict
version of Text IO just using plain Data.Text type?
and how can I get from internal type to regular type when using Data.Text?

also the internal type doesn't appear to be reflected in the haddock:
 
http://hackage.haskell.org/packages/archive/text/0.7.1.0/doc/html/Data-Text-Lazy-IO.html

ghc-pkg list | grep -i text
    text-0.7.1.0

thanks for any help!
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