org.springframework.faces.webflow.FlowResourceResolver incompatible with JSF 1.2

org.springframework.faces.webflow.FlowResourceResolver changed its implementation from SWF 2.1.0 M2 to SWF 2.1.0-RELEASE in that it now extends a JSF 2.0 class (javax.faces.view.facelets.ResourceResolver) and hence is not compatible with JSF 1.2 applications. For example, a web.xml declaration like

<context-param>
<param-name>facelets.RESOURCE_RESOLVER</param-name>
<param-value>org.springframework.faces.webflow.FlowResourceResolver</param-value>
</context-param>
.
will break the JSF 1.2 application containing this web.xml