Method put

core_js/utils/Multimap.js:52–65

(key, value)

        }
    }
    put(key, value) {
        let values = this._map.get(key);
        if (!values) {
            values = new Set();
        }
        const count = values.size;
        values.add(value);
        if (values.size === count) {
            return false;
        }
        this._map.set(key, values);
        this._size++;
        return true;
    }
    has(key) {
        return this._map.has(key);
    }