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You can't just blanket remap tab as it's overloaded for org-cycle, helm-select-action, expand in ido and so on.

You can remap it in global map, or prog-mode map, so it would keep the customized behaviour in other modes.

Thank you! global-map did the trick for me, though I seem to have tried it a few years ago without success: https://news.ycombinator.com/item?id=29726398#29731027