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“spelt” vs “spelled”

Interesting discussion re “spelt” vs “spelled” at English Language & Usage Stack Exchange, which, incidentally, is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It starts with the question:  

In the following sentence, should I say spelled or spelt:
You spelt/spelled “Pneumonoultramicroscopicsilicovolcanoconiosis” [!!!] wrong.

See below for apparently authoritative conclusions from