function filled( len, dtype, value ) {
	var buf;
	if ( dtype === 'complex64' ) {
		buf = filledarray( value, len*2, 'float32' );
		return new Complex64Array( buf.buffer );
	}
	if ( dtype === 'complex128' ) {
		buf = filledarray( value, len*2, 'float64' );
		return new Complex128Array( buf.buffer );
	}
	return filledarray( value, len, dtype );
}
Returns a filled array according to a provided fill value.

@private
@param {NonNegativeInteger} len - array length
@param {string} dtype - array data type
@param {*} value - fill value
@returns {Collection} filled array