On Friday, October 13, 2023, PG Doc comments form <nore...@postgresql.org>
wrote:

> both of them round any precision
> beyond microseconds, and neither returns timestamps with greater precision
> than the value that was inserted.
>

That is precisely what a no default with maximum of six means.  If we say
the default is six that would imply storage of less precise values pads
significant zeros until there are six.

David J.

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