ratio function w/ parameters such as `golden-ratio(), 4 `no longer work inside singularity's +add-grid() mixin

[lozandier]

For some reason the following has not worked for me and similar attempts to use the other ratio functions:

+add-grid(ratio(golden-ratio(), 4))
+add-gutter(golden-ratio() * 1em)
+add-gutter-style(split)

// Note that + refers to @include  (.sass)   

Other ratio functions referring to other ratios also don't seem to work.

Example of this behavior can be found here.

Environment I'm experiencing this error:

• SassMeister
• Locally using a Bundle file w/ the lastest version of Compass, Sass, and Singularity included w/ Singularity Extras.