a discarded white-space mixin with a robust parameter range

white-space.sass

@mixin white-space( $options, $vertical: true )
    $box-model-white-space: ()
    $prop: null

    @if ( type-of($options) == 'map' )
        @each $rel, $map in $options
            @if ( $rel != 'inner' and $rel != 'outer' )
                $prop: 'padding'
                @each $modifier, $unit in $options
                    #{ $prop }-#{ $modifier }: #{ $unit }
            @if ( $rel == 'inner' )
                $prop: 'padding'
            @else
                $prop: 'margin'
            @each $modifier, $unit in $map
                #{ $prop }-#{ $modifier }: #{ $unit }
    @else
        @if ( $vertical == true )
            padding-bottom: $options
        @else
            padding-top: $options
            padding-bottom: $options