I suggest instead that it is the speaker's dialect that is being produced: 'come' as simple past. It occurs among the less educated in the southern US, for example.
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Mister Micawberless educated
eipjooSo the word 'come' has to be changed into "came," right?No. Why would you change the author's writing?
Mister MicawberNo. Why would you change the author's writing?Yes, I know what you mean. That was my careless words. I should have attached the word, grammatically. Thank you for your awakening.