We actually have Huck Finn in our catalog, and of course we've preserved all of the vernacular. I invite you to check it out for yourself to see what you think. "Light modernization" in our sense doesn't mean "ham-fistedly change old-timey vernacular into new-fangled internet slang", it simply means some basic, mostly-automated one-to-one spelling and hyphenation updates. Things like "develope -> develop" and "to-night -> tonight", that would not change the meaning of the text. Vernacular is not affected by these changes, nor would we want it to be. :)

Think of it more like modernizing spelling of Shakespeare, so that we can enjoy the text and not spend time parsing spelling like:

  Had, having, and in quest, to have extreame,
  A blisse in proofe and provd and very wo,
  Before a joy proposd behind a dreame...

Some people might prefer that old-fashioned spelling, and it might be of some use to academics and historians, but I think the majority of casual modern readers would have an easier and more enjoyable time with light modernization.