[Haskell-cafe] Turtle library : grepping on Text vs FilePath

Dear list On the Turtle library, the grep function got the following signature grep :: Pattern a -> Shell Line -> Shell Line For it to filter output of the `ls :: FilePath -> Shell FilePath` I got to fmap and transform via de Turtle.Format or Turtle.Line modules. Is this an indicator I shouldn't be doing this? Is the library telling me to use `find`? or is just accidental? -- -- Ruben