How pass a converter into a composite component with p:inputText? - jsf

Question

I want to put a filter of a p:datatable into a composite component. The filter use the p:inputText tag and an p:ajax tag to define a typing delay. The problem is, that the converter inside the composite component do nothing. When I use javax.faces.Long, the filter is always String.
The working code, that I want to use in a facelet:
<p:column headerText="colum title"
filterBy="#{p.p.idx}" sortBy="#{p.p.idx}">
<f:facet name="filter">
<p:inputText id="indexFilterInput"
converter="javax.faces.Long" class="ui-column-filter">
<p:ajax event="keyup" delay="800"
oncomplete="PF('portDT').filter()" />
</p:inputText>
</f:facet>
<h:outputText value="#{portRow.portIdx}" />
</p:column>
I put the f:facet into the composite component:
<ui:component xmlns="http://www.w3.org/1999/xhtml"
xmlns:p="http://primefaces.org/ui"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:cc="http://xmlns.jcp.org/jsf/composite">
<cc:interface>
<cc:attribute name="widgetVar" />
<cc:attribute name="delay" />
<cc:attribute name="converter" />
<cc:insertFacet name="filter" />
</cc:interface>
<cc:implementation>
<f:facet name="filter">
<p:inputText id="filterInput" converter="#{cc.attrs.converter}"
class="ui-column-filter" type="search">
<p:ajax event="keyup" delay="#{cc.attrs.delay}"
oncomplete="PF('#{cc.attrs.widgetVar}').filter()" />
</p:inputText>
</f:facet>
</cc:implementation>
</ui:component>
Here is the call of the component gf:filterField:
<p:column style="width:4em"
headerText="#{lbl['general.column.id']}" exportable="true"
filterBy="#{p.p.id}" sortBy="#{p.p.id}">
<gf:filterField id="index" widgetVar="portDT" delay="800" converter="javax.faces.Long"/>
<h:outputText value="#{portRow.portId}" />
</p:column>
When change the converter in the p:inputText inside the composite component, the converter is also ignored. I need to pass the converter as a parameter, because some columns are String columns and some are Long.
Is there any other tag in the cc:interface as cc:attribute?