Problem Summary:
When using wrapper mixins (like dark-theme()) and passing a handmade palette with unquoted keys, it causes a compilation error. However, if the keys in the palette are quoted, the error is resolved, and the mixins work as expected.

STEPS TO REPRODUCE

1. Create a handmade palette

$handmade-palette: (
    primary: (
        50: #e6eff8,
        '50-contrast': black,
        100: #bfd7f2,
        '100-contrast': black
    ),
    secondary: (
        50: #fef7e2,
        '50-contrast': black,
        100: #fdeab7,
        '100-contrast': black
    )
    ...
);

2. Use the palette in a wrapper mixin like dark-heme():

@include dark-theme(
    $palette: $handmade-palette
);

3. Compilation error occurs.

BEHAVIOR:

Unquoted keys in palettes cause compilation errors.
Quoting keys resolves the issue.

EXPECTED BEHAVIOR:

The wrapper mixins (or theme()) should handle both quoted and unquoted keys in handmade palettes, OR
The documentation should explicitly state that palette keys must be quoted to avoid errors.