[perl #125975] [BUG] INIT-time constants are awkward

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Consider this snippet:

  constant NOW = DateTime.now;

That is a BEGIN-time declaration + initialisation. C<NOW> will contain
the time of compilation.

On the other hand:

  my \NOW = DateTime.now;

does run-time initialisation, so you get a different time at each run.

There does not seem to be a nice way of having a C<constant> with an
INIT-time initialiser:

  constant NOW = INIT DateTime.now;

sets C<NOW> to C<Mu>, since a BEGIN time that INIT block has not run.

Is there already a working way to do that? Should there be?

Thanks.