function-return-unitless

// Accepts a value and returns it without a value
@function return-unitless($value)
{
    @if unitless($value) {
		@return $value;
	}

	$unit: unit($value);

	@if $unit=="px" {
		@return $value / 1px;
	}
	@if $unit=="rem" {
		@return $value / 1rem;
	}
	@if $unit=="em" {
		@return $value / 1em;
	}
	@if $unit=="%" {
		@return $value / 1%;
	}
	@if $unit=="pt" {
		@return $value / 1pt;
	}
}