Deprecation warning when passing a list fonts to mat-typography-config

Bug, feature request, or proposal:

Bug

What is the expected behavior?

mat-typography-config accepts a list of fonts.

What is the current behavior?

mat-typography-config throws a deprecation error:

DEPRECATION WARNING: Passing "Open Sans", sans-serif, a non-string value, to unquote() will be an error in future versions of Sass.

What are the steps to reproduce?

$custom-typography: mat-typography-config(
    $font-family: 'Open Sans', sans-serif;
);

[josh18]

Ah you are right, it does throw a compile error if you put in 'Open Sans', sans-serif 😳. However if you use a variable it throws the deprecation warning, e.g.:

$myFontFamily: 'Open Sans', sans-serif;

$custom-typography: mat-typography-config(
    $font-family: $myFontFamily;
);

So I guess the answer is to use the quote function:

$custom-typography: mat-typography-config(
    $font-family: quote($myFontFamily);
);

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