Customizer uses variables as strings when used as values

[Clemens]

Describe the bug
Parsing of variables is not working correctly. Variable names are detected as strings when used as values.

To Reproduce
The following script:

    a=6;
    b=7.5;
    c=8;
    v=[a,b,c];
    
    echo(a,b,c,v);

results in ECHO: 0, 7, 8, ["a", "b", "c"]