function set( size ) {
	/* eslint-disable no-invalid-this */
	if ( !isNonNegativeInteger( size ) ) {
		throw new TypeError( format( 'invalid assignment. `%s` must be a nonnegative integer. Value: `%s`.', 'size', size ) );
	}
	if ( size !== this._size ) {
		debug( 'Current value: %d.', this._size );

		this._size = size;
		debug( 'New Value: %d.', this._size );

		this.emit( 'change' );
	}
}
Sets the tick (tassel) size.

@private
@param {NonNegativeInteger} size - size
@throws {TypeError} must be a nonnegative integer