blaze-textual is a library for rendering Haskell data types to bytestrings. It is now available in Fedora. Install it using:

$ sudo yum install ghc-blaze-textual-devel

You can import the Text module (for example) using:

ghci> :m + Blaze.Text

A simple example of using digit, integral, and float functions is shown below:

import qualified Data.ByteString.Lazy as L
import Blaze.ByteString.Builder

import Blaze.Text
import Blaze.Text.Int

main = do
     let a = toLazyByteString $ digit 3
         b = toLazyByteString $ integral 3
         c = toLazyByteString $ float 3
     L.putStrLn a
     L.putStrLn b
     L.putStrLn c

You can compile it using:

$ ghc --make test.hs
[1 of 1] Compiling Main             ( test.hs, test.o )
Linking test ...

Running test gives:

$ ./test
3
3
3.0