A little while back, it was had did, and other uses of did, rather than done, as the PSP (past participle) of the verb DO. Non-standard PSP did is a (partial) regularization of the system of verb forms in English; all regular verbs, and a great many irregular ones as well, have identical PST (past) and PSP: jump ~ jumped ~ jumped, buy ~ bought ~ bought. PSP did improves the fully irregular pattern do ~ did ~ done to the somewhat more regular do ~ did ~ did. As I pointed out in the earlier posting, the most common non-standard partial regularization for DO is using done for the PST: do ~ done ~ done (similarly, see ~ seen ~ seen).
What I didn't say in that posting — because I've mentioned it several times in the past — is that the regularization to PSP did is in fact in the usual direction of verb regularization, which gives non-standard I have took / went / rode / wrote etc. John Cowan has now reminded me of this, and also reminds me that H. L. Mencken, in The American Language, refers to this regularization as a feature of "The Common Speech" — widespread, non-regional, non-standard American English. It now seems that the geographical and social distribution is more complex than that, that PSP did has some association with Southern varieties and with AAVE (as several correspondents have suggested to me). And that I have saw is out there too.
Looking into these things brought me to Richard Meade Bache's Vulgarisms and Other Errors of Speech (which I've seen on-line in the 2nd edition (1869)), with its note on I have saw.
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