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API Prep DataList for immutability in 3.1 per 7673
DataList had several methods that should act on a copy and return that copy, but was instead mutating the existing list. We cant change this behaviour in the 3.0 line for backwards compt. reasons, but this makes the desired behavior the default, and makes disabling the mutation in 3.1 easier It also introduces two new methods to deal with the common pattern of wanting to modify the underlying dataQuery, which we want to be able to reliably do in a way that always acts immutably. The main method of these two is alterDataQuery
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