I aim to make a search mechanism on my DOM module, but the below filter to look something up is case sensitive.
var titleFilter = DomInstanceExposers.FieldValues.DomInstanceField(FieldDescriptors.Title.ID).Contains(freeText);

How do I make it get all the matching DomInstances where a specific Field contains an case insensitive value.

E.g.
DomInstances where the Title = Test or test should both be captured by the filter.