// rather than happen on the heap.
	var out [p521ElementLen]byte
	return e.bytes(&out)
}

func (e *P521Element) bytes(out *[p521ElementLen]byte) []byte {
	var tmp p521NonMontgomeryDomainFieldElement
	p521FromMontgomery(&tmp, &e.x)
	p521ToBytes(out, (*p521UntypedFieldElement)(&tmp))
	p521InvertEndianness(out[:])
	return out[:]
}

type p521MontgomeryDomainFieldElement [9]uint64

// The type p521NonMontgomeryDomainFieldElement is a field element NOT in the Montgomery domain.
//