geoserver - Dynamic Symbolizers w/ CQL not URL encoded

I am trying user Dynamic Symbolizers in my SLD:

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How if the value of 'some_type' has characters in it that need to be URL encoded the URL after parsing the CQL is invalid.

An easy example is if the value has a space in it i.e. 'Some Value'. Which produces the URL http://localhost/icons/Some Value, and it should probably produce: http://localhost/icons/Some%20Value.

Am I using CQL correctly in this instance. I looked through the provided functions here:

https://github.com/geotools/geotools/tree/master/modules/library/main/src/main/java/org/geotools/filter/function

and did not find one specific to URL encoding. That being said its not a huge deal to write a filter function to do this. However if you can use CQL in the href of an OnlineResource the core CQL parsing logic should probably handle this.

Is there anything else I might be missing? Crossing my fingers ;)