Documentation

Fields

• countRepeated :: Maybe Int

  Optionally predicts the number of elements in the sequence. Predict the count only when it is practical to do so accurately and quickly.

  A prediction that is too low causes undefined behavior--possibly a crash. A length prediction that is too high overallocates output space, as if the sequence really were that length.

• reverseRepeated :: FoldR e

  A lazy right-associative fold over the reverse of the desired sequence of field values.

  Design Note: We could have used a lazy left-associative fold, but vectors perform such folds using a left-to-right iteration, instead of the right-to-left iteration that would yield best performance.

  Therefore in order to avoid accidental misuse of foldl, we ask for sequence reversal explicitly. Thanks to vector fusion rules, it is fast to foldr on the result of reversing a vector.