Addressing IPv6 Serial Links – /64 or /126?

What is the proper subnet to assign to an IPv6 serial links?

The standards say that every single network segment should get a full /64 regardless of how small or large the segment is in terms of the number of hosts requiring addresses.  This makes good sense, particularly because the /64 boundary was designed according to the specifications for Stateless Address Auto-Configuration (SLAAC).

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