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Check if ``p`` represents a point on the edwards25519 curve, in canonical
form, on the main subgroup, and that the point doesn't have a small order.
:param p: a :py:data:`.crypto_core_ed25519_BYTES` long bytes sequence
representing a point on the edwards25519 curve
:type p: bytes
:return: point validity
:rtype: bool
:raises nacl.exceptions.UnavailableError: If called when using a
minimal build of libsodium.
Not available in minimal buildZraisingz=Point must be a crypto_core_ed25519_BYTES long bytes sequence ) r has_crypto_core_ed25519excUnavailableError
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