has a unit (not px or rem, like 1.5em) or $ is 0, just print the value\n  @if not $fs-unit or $fs-unit != \"\" and $fs-unit != \"px\" and $fs-unit != \"rem\" or $fs == 0 {\n    font-size: #{$fs}#{$rfs-suffix};\n  }\n  @else {\n    // Variables for storing static and fluid rescaling\n    $rfs-static: null;\n    $rfs-fluid: null;\n\n    // Remove px-unit from $fs for calculations\n    @if $fs-unit == \"px\" {\n      $fs: $fs / ($fs * 0 + 1);\n    }\n    @else if $fs-unit == \"rem\" {\n      $fs: $fs...