SQLDataSource ignores operationBinding.invalidateCache="true"?

[claudiobosticco]

SC_SNAPSHOT-2011-07-05/PowerEdition

I've modified the datasource of the sample #customExport and I've added:
<operationBinding operationType="fetch" operationId="fetch" invalidateCache="true">
<serverMethod>fetch</serverMethod>
</operationBinding>

then I was expecting that countryList.fetchData(null) will always fetch data...but this is not the case.
Have I misunderstood this setting or is it a bug?

[Isomorphic]

You've misunderstood the setting. operationBinding.invalidateCache will cause invalidateCache to be set on all dsResponses for that operationBinding. But if you look at the docs for listGrid.fetchData(), it makes a client-side determination of whether a new fetch is required, and this does not involve a DSResponse.