add_contact_features

Description:

public void add_contact_features (ContactFeature[]? features)

Add features to the desired features to be prepared on Contact objects.

Those features will be added to the features already returned be dup_contact_features.

Note that these features will not be added to existing Contact objects; the user must call upgrade_contacts themself.

this	a SimpleClientFactory object
features	an array of desired features (may be `null` if `features.length` is 0)
n_features	The number of features in `features` (may be 0)