The rules in Sections 20 to 24 of the Sale of Goods Act, 1930 are:

Section 19(3) says that unless a different intention appears, "the rules contained in sections 20 to 24 are rules for ascertaining the intention of the parties as to the time at which the property in the goods is to pass to the buyer". They are default rules, not mandatory ones, and they deal with property, not damages or delivery.