The even sober part suggests to me that it is a local and slightly unusual form, and learners may benefit from a broader picture. Many learners are surprised, nay shocked, when they go to London and hear what the natives in parts of that city use, as it goes against the grammar they have studied. I don't see that alerting people to the fact that there are many non-standard forms used by native speakers is a bad thing. Dropping the /t/ in things like next is not uncommon in regions in BrE- a visitor to the UK is very likely/almost certain to hear it. They can learn standard English here, but also the differences found in regions and variants, which I see as a strength of things like forums. When I started teaching in the 1980s, the differences between American and British English largely consisted of a page or two or vocab like faucet/tap, but for the last decade I have been in daily contact with speakers of various forms of English and have learnt a whole lot more about the many small differences.