funny bold ouput in GHCI

Using GHCI 5.04.2, in some interpreter output (including at least error
messages and types displayed by :t), the '>' character of a '->' lexeme
appears in bold on my terminal.  For example:

*Data> :t execProgram
FilePath
-> [String]
   -> Maybe [(String, String)]
      -> Bool -> Maybe FilePath -> [(Fd, Fdx)] -> DB ()

In the above, though it obviously doesn't show here, each '>' character
(except the first!?) shows as bold.  Note that the '-' characters of the
'->' lexemes do not show as bold.  I find all of this very peculiar,
albeit innocuous.