This caused a bug in Lua Carousel. Scenario:
color
Before this commit, carousel.love would silently exit, and driver.love would then hang waiting for it to come back. The cause:
After restarting carousel.love, the error shows up in driver.love:
Error: live.lua:104: bad argument #3 to 'color' (number expected, got no value) stack traceback: [C]: in function 'color' live.lua:104: in function 'receive_from_driver' …
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