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Prevously we allowed these properties to be undefined, and then later tried to do computations on the values. That doesn't work; they either need to have an integer default value or require that a value is supplied.

Since implementations currently seem to raise an exception for these values being undefined, the easiest approach is to require that they are supplied, so that's what's implemented here.

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Tests in https://phabricator.services.mozilla.com/D152645

@AutomatedTester could you maybe have a look? Thanks!