Comment (by Roland Haas):

During today’s ET call http://lists.einsteintoolkit.org/pipermail/users/2020-October/007620.html Peter provided an update:

This needs to be reviewed for the next release. Peter has begun the process of review and doesn't expect any major issues.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2417/include-pn-expressions-for-initial-momenta