Using StyleInjector with Polymer and Custom CSS Properties

I use StyleInjector to inject CSS rules that work with Shadow DOM Custom Properties: https://www.polymer-project.org/2.0/docs/devguide/shadow-dom

A snippit from the CSS I inject:

event-action-table.event-action-list-editor {
    --table-height: 200px;
    a-property-with-no-double-minus-prefix: 0;
}

A snippit from the custom element template:

    <style>
        vaadin-grid {
          width: 100%;
          height: var(--table-height);
        }
    </style>

However, at run time, it looks like anything that is prefixed with '--' get's ignored by the injector. In the above case, my output element style looks like:

event-action-table.event-action-list-editor {
    a-property-with-no-double-minus-prefix: 0;
}

Why is that?

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