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igDataSource filtering customFunc not working

I am trying to filter my igGrid data based on a combination of nested AND and OR conditions. According to these old topics that is not supported by igGridFiltering:

One of the proposed workarounds looks to be ideal, the customFunc setting on the datasource. Here it is in the latest documentation:

However, this function does not seem to work. Adding a console.log shows that it is not being called at all.


Any other suggestions on how to apply a complex filtering are also appreciated.