All frozen libraries have been updated to their latest versions as of 2019-01-05.
Added runtime.serial_bytes_available. Returns True if any bytes are available to read on the USB serial input. Allows for polling to see whether to call the built-in input() or wait. (read-only). Thanks to @ATMakersBill.
nRF52840-related builds were removed from 3.x as of 3.1.2 because certain software downloads that 3.x depends on were removed from Nordic’s website. It is no longer possible to build these on the 3.x branch. But see the 4.0 (master) branch for viable and better support for nRF52840. Note also that nRF52832 builds from commits before 3.1.2 will no longer build due to changed download locations on the Nordic website. Thanks to @dhalbert.
Pre-built mpy-cross executables are available above for MacOS, Windows, Ubuntu, and Raspbian. For MacOS, Ubuntu, and Raspbian, you must make the mpy-cross download executable by doing. Then you can compile a .py file to .mpy:
$ chmod +x mpy-cross-whatever-you-downloaded # you only need to do this once
$ ./mpy-cross-whatever-you-downloaded yourfile.py # this will generate yourfile.mpy
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