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import { increment } from '@datorama/akita';

this.peopleStore.update(id, person => ({
  guests: increment(person.guests)
}));

this.peopleStore.update(id, person => ({
  guests: increment(person.guests, { maxValue: 10 })
}));

import { decrement } from '@datorama/akita';

this.peopleStore.update(id, person => ({
  guests: decrement(person.guests)
}));

this.peopleStore.update(id, person => ({
  guests: decrement(person.guests, { allowNegative: true })
}));