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