modify()
This method should only be used when creating a Rule.
This method returns an object which modifies the properties of a behavior for that particular Rule. The modified behavior is identical to the original except that its get() method will search the modified behavior for default properties.
Syntax
new jsb.Rule(selector, behavior.modify(properties));
Example
new jsb.RuleList({
"input.age": number,
"input.age.adult": number.modify({min: 18})
});