Proposal for a better rtl() mixin that takes a class name

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

@mixin rtl($class: '') {
  #{'html[dir="rtl"]' + $class} & {
    @content;
  }
}

.view {
  text-align: left;
  @include rtl {
    text-align: right;
  }
}

.fanciness {
  html.flexbox & {
    color: red;
  }
  
  @include rtl('.flexbox') {
    color: blue;
  }
}

SassMeister-output.css

.view {
  text-align: left;
}
html[dir="rtl"] .view {
  text-align: right;
}

html.flexbox .fanciness {
  color: red;
}
html[dir="rtl"].flexbox .fanciness {
  color: blue;
}