code: function _getDefaultFilterCoercionType(explorer, filter) {
    var propertyType = ProjectUtils.getPropertyType(
      ProjectStore.getProject(),
      explorer.query.event_collection,
      filter.property_name);
    var targetCoercionType = FormatUtils.coercionTypeForPropertyType(propertyType);
    return targetCoercionType;
  }
docs: Get the default coercion type for this filter based off the filter's property_name's set type
  in the project schema.
  @param  {Object} explorer  The explorer model that the filter belongs to
  @param  {Object} filter    The filter
  @return {String}           The default coercion type