Looks like the Adafruit level shifter has the same problem as the old 
Sparkfun model (https://www.sparkfun.com/products/8745): the resistors are 
all the same size and it shifts 5V down to 2.5V instead of 3.3V. After 
years of complaints, they finally fixed the design 
(https://www.sparkfun.com/products/11978).

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