libghc-text-doc 0.11.2.3-2 (amd64 binary) in ubuntu saucy

 This is a Haskell time and space-efficient implementation of Unicode
 text using packed Word16 arrays. Suitable for performance critical use,
 both in terms of large data quantities and high speed.
 .
 It supports many basic string operations and has some substring search
 tools.
 .
 This package contains the library documentation.