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In the examples section on the website, the Pie Chart example refers to the global "angles" array instead of the local function parameter "data". The example works because the sketch only calls pieChart while passing in the "angles" array. But a more robust, more copy-pasteable, less head-scratching example would refer to the "data" local variable instead of the "angle" global variable.
Who can make this change to the example on the website? Also, it is not clear which category this post ought to go into.