////
/// @author Daniel Perez Alvarez
////

/// Returns a radian when given a degree
/// @since 2.0.0 - The Jedi
/// @param {Number} $angle
/// @return {Number} a radian
/// @example
///   rad(45deg) // 0.78539816
@function rad($angle) {
	$unit: unit($angle);
	$unitless: $angle / ($angle * 0 + 1);

	// If the angle has 'deg' as unit, convert to radians.
	@if $unit == deg {
		$unitless: $unitless / 180 * $pi;
	}

	@return $unitless;
}