why not use '==' in the return code in state()？

[wanyaxing]

vue-checkbox-radio/src/components/Radio.vue

            state() {
                if (this.modelValue === undefined) {
                    return this.checked;
                }
                return this.modelValue === this.value;
            }
        },

In my project, the modelValue sometimes is INT type, and here the state() will return false :(

so, why not use '==' in the return code in state()？