[
    100000000000000.01, 100000000000000.011,
    100.01, 100.011,
    10000000000000.001 / 10000.0, 1000000000.0000001000,
    0.001, 0.0010000001,
    0.000000000000000000000101, 0.0,
    sqrt(2) * sqrt(2), 2.0,
    -sqrt(2) * sqrt(2), -2.0,
    sqrt(-2) * sqrt(-2), -2.0,
    cbrt(3)**3, 3,
    cbrt(-3)**3, -3,
    100000000000000003.0, 100000000000000004.0,
    3.14159265358979323846, 3.14159265358979324
].each_slice(2, {|a,b|
    say ("#{a} ≅ #{b}: ", a ≅ b)
})