Add a span_ function, using unboxed tuples, to Text.Private.
Use span_ in a few places where it can help a little.
Relax the constraint on rational to Fractional.
Specialize over many more integral types.
Replaced occurences of 'find' in the 'breakOnAll' examples. Also
replaced 'find' with 'breakOnAll' in the Indexing discussion. Replaced
'find' with 'breakOnAll' in 'breakOn' discussion in Data.Text.Lazy.