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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
Yes, that'd be preferable - but you can also add Micro or Mini USB now, as long as you're willing to scrape off some solder resist.
I've asked how much extra the castellations will cost. Hopefully not much, but they're actually done by creating holes and cutting through them, so I guess it blunts the milling machine more quickly.