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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'd just connect direct (and have done in the past) - however the MDBT42 breakout already has a regulator so it doesn't really matter anyway.
The 'absolute maximum' voltage for the nRF52832 is something like 3.9v IIRC. 3.9v isn't something you'd want to actually go close to, but going 0.07v past their recommended voltage at max battery charge isn't going to stress the chip out too much.