SCSS Processor Unicode Output Incorrect - unicode

Question

I have tested this issue using Scout-App and Visual Studio Code on Windows 10.
Having just downloaded Font-Awesome 4.7.0 SCSS files and set up a project/workspace, I have noticed a problem with unicode output. As an example:
in the '_variables.scss' partial, we have:
$fa-css-prefix: fa;
$fa-var-music: "\f001";
and in '_icons.scss' partial, we have:
.#{$fa-css-prefix}-music:before { content: $fa-var-music; }
with an expected result of:
.fa-music:before { content: "\f001"; }
but the output is:
.fa-music:before { content: ""; }
So all the unicode values stored in variables are processed to 
Thus I am unable to correctly compile the correct output for a modified font-awesome CSS file.
I have tried placing UTF8 encoding at the top of each SCSS file but the issue is still unresolved.
For a quick test, this will produce the result described:
test.scss
#charset "UTF-8";
$fa-css-prefix: fa;
$fa-var-music: "\f001";
.#{$fa-css-prefix}-music:before { content: $fa-var-music; }

Answer 1

It seems by writing:
"\f0a9" ,
Scout will compile the unicode character.
But, if you use interpolation:
#{'"' + \f0a9 + '"'}
then Scout will compile to "\f0a9".
You can also use variables like
$escaped: \f0aa;
...
#{'"' + $escaped + '"'}
or:
$escaped: f0aa;
...
#{'"\\' + $escaped + '"'}
Remarks:
The compiled unicode character may become a problem to the browser in the content attribute. Therefore you want to give him the written hex code.
If you mess around with the backslash and the interpolation, see also here:
Sass variable interpolation with backslash in output