Cannot change default of Boolean checkbox custom profile field

If one creates a Boolean CPF of the checkbox type and selects a default value of either checked or unchecked, the value of 1 or 0, respectively, are entered in the field_default_value field of the profile_fields table. If you subsequently edit the default value from checked to unchecked, or from unchecked to checked, the value in the field_default_value field does not change and hence the edit is not effective.