I'm going to leave a redundant call to love.graphics.setBackgroundColor in pong.splua, just to avoid thinking about where to move the corresponding log line.
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love.window.setVSync(0) -- simplify profiling; we're not a game
love.keyboard.setTextInput(true) -- bring up keyboard on touch screen
love.keyboard.setKeyRepeat(true)
love.graphics.setBackgroundColor(1,1,1)