Just tried in the console of Chrome (with "Experimental JavaScript features" 
flag enabled).

    > Math.log2(8) 
    < 2.9999999999999996

Firefox gives me the correct answer (3).

Question: Should Math.log2 give exact results for powers of 2?

The same issue holds for Math.log10 (might be applicable for nonnegative powers 
only): Math.log10(1e15) != 15 in Chrome.

—Claude
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