esp8266/mpconfigport: Enable MICROPY_PY_BUILTINS_SLICE_ATTRS #2503
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This makes the resulting firmware larger by 40 bytes on my build.
While I agree that adding support to slicing user objects is a rare case for everyday application code, it is much more common when writing libraries and drivers, especially if one aims for a convenient and intuitive user interface. I stumbled upon the missing attributes trying to write a driver for my 18-channel servo controller (I wanted to be able to set multiple servo positions at once in a single command using slices), but it would also be useful for the NeoPixel and APA LED drivers, LED matrix drivers, display drivers, and basically anything that controls multiple things.