Error using Angular Material

[alisterlf]

When a run Stylelint, the following line
$my-app-accent: mat.define-palette(mat.$pink-palette, A200, A100, A400);

Is being changed to
$my-app-accent: mat.define-palette(mat.$pink-palette, a200, a100, a400);

Resulting the following error
SassError: 'Hue "a200" does not exist in palette. Available hues are: 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, A100, A200, A400, A700, contrast'

[alisterlf]

I found a workaround using
"value-keyword-case": null