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SassMeister-input.scss

// ----
// Sass (v3.3.5)
// Compass (v1.0.0.alpha.18)
// ----

// Because of the way floats work in any language
// You cannot expect a float to be precise.
// ---
// While one could expect 0.12 to equal 0.10 + 0.02
// Unfortunately, it is not. 
// ---
// Hence a little function to check whether 2 floats are equal or not
// Inspired by: https://github.com/nex3/sass/issues/1224
// ---
// @param [number] $a: first number
// @param [number] $b: second number
// @param [number] $tolerance: tolerance (epsilon)
// ---
// @return [bool]
@function approximately-equal($a, $b, $tolerance: 0.0000001) {
  @return abs($a - $b) <= $tolerance;
}

// Alias
@function a-equal($a, $b, $tolerance: 0.0000001) {
  @return approximately-equal($a, $b, $tolerance);
}

// Test
test {
  $a: 0.12;
  $b: 0.10 + 0.02;
  bug: $a == $b;
  fix: approximately-equal($a, $b);
}

SassMeister-output.css

test {
  bug: false;
  fix: true;
}