@function rhythm behaves differently than compass

[jasunde]

When using $font-unit: 1rem the rhythm function still outputs a calculation like what is need when using ems for the rhythm unit. I'm a n00b here so I'm not sure the proper way to make this suggestion:

// Calculate rhythm units.
@function rhythm(
$lines: 1,
$font-size: $base-font-size,
$offset: 0
) {
@if not($relative-font-sizing) and $font-size != $base-font-size {
@warn "$relative-font-sizing is false but a relative font size was passed to the rhythm function";
}

// Suggestion //
@if $font-unit == 1rem {
$font-size: $font-unit;
}

$rhythm: $font-unit * ($lines * $base-line-height - $offset) / $font-size;
// Round the pixels down to nearest integer.
@if unit($rhythm) == px {
$rhythm: floor($rhythm);
}
@return $rhythm;
}