So, ruby-sass throws an error when a map is declared that has any duplicate keys, including any at nested levels. i.e. maps that are values or keys within other maps:
$map: (
alpha: 1,
beta: 2,
gamma: 3,
delta: (
eta: 5,
eta: 6,
),
);
Duplicate key "eta" in map (eta: 5, eta: 6).
Libsass currently does not run this check, and should; however, libsass can also do better than ruby-sass here. Note that ruby-sass fails to pick up duplicate-key maps that result from other operations. Example:
$map1: (
alpha: 1,
beta: 2,
gamma: 3,
);
$map2: (
alpha: 2
);
$map3: join($map1, $map2);
.test {
out: inspect($map3);
}
.test {
out: alpha 1, beta 2, gamma 3, alpha 2;
}
So imo libsass should have a map-validity check routine that runs on anything that involves SassScript maps or lists (as the latter may contain a map) as outputs or assignments.
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