Compile error when compiling Foundation SCSS witin Sanic Framework using sanic-sass

[headkit]

When compiling Foundation SCSS files with sanic-sass in Sanic Framework, which uses libsass 0.22.0, I get the error

File ".../venv/lib/python3.8/site-packages/sass.py", line 725, in compile
    raise CompileError(v)
sass.CompileError: Error: Invalid CSS after "    @return math": expected expression (e.g. 1px, bold), was ".abs($a);"
        on line 23:17 of templates/vendor/foundation/scss/util/_math.scss
        from line 5:1 of templates/vendor/foundation/scss/util/_util.scss
        from line 25:1 of templates/vendor/foundation/scss/foundation.scss
        from line 1:1 of templates/scss/main.scss
>>     @return math.abs($a);

(Python 3.8.0)

Link to sass.py
Link to _math.scss

Thank you!

[asottile]

we just wrap libsass so your question is probably better asked there