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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'll comment on the issue tracker, but I believe this is a known issue because ESP8266 is using a 32kHz RTC as the base for all timings.
It won't be to do with using non-integer values (other than you're asking for the pulse length to be shorter than Espruino can accurately manage), and the 1ms pulse length that's sorting things out for you is probably because it's something that can be accurately scheduled with the 32kHz RTC which helps to 'sync' everything up.