Method addAttribute

source/python.js:10544–10551

(name, type, is_parameter, is_buffer)

                return this._attributes.length;
            }
            addAttribute(name, type, is_parameter, is_buffer) {
                is_parameter = is_parameter || false;
                is_buffer = is_buffer || false;
                const slot = this._attributes.length;
                this._attributes.push({ name, type, is_parameter, is_buffer });
                this._attributeTypes.push(type);
                return slot;
            }
            addOrCheckAttribute(name, ty, is_parameter, is_buffer) {
                is_parameter = is_parameter || false;
                is_buffer = is_buffer || false;