When proofreading the following sentence:
I hadn't got back to his email yet.
With language set to English (UK), Kagi suggests replacing got with gotten with the following justification:
The single change standardises the past participle of 'get' from British English ('got') to American English ('gotten') in the perfect tense. This is a dialectal/style adjustment affecting usage rather than sentence meaning; it improves consistency with American English conventions but does not change the sentence's intended message
Suggestions should respect the desired regional variant of a language.
