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Comment by darrhiggs | Hacker News Reader

It seems[0] as though in british english (.gov.uk) learnt is acceptable.

"Learnt" and "learned" are both acceptable spellings. The issue is that the former is an adjective and the latter is a verb (past-tense).

See my comment.

There is no issue. Both learned and learnt are acceptable and attested for the verb, pace the OED:

    learn, v.
    Forms:  Pa. tense and pple. learned /lɜːnd/ , learnt /lɜːnt/ .