Only things I can think of are:
To ensure that the pins are actually in 'high drive' mode...
peek32(0x50000724)&0x700 == 0x700;
peek32(0x50000728)&0x700 == 0x700;
But I'm pretty sure they should be...
var i2c = new I2C(); i2c.setup(...)
But it's possible that because I2C uses pullups, the leakage is actually enough to cause trouble
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