Opening hours rules: why is it possible to specify multiple monthdays after a month?

I was reading about how opening_hours rules work, and I’ve found this example:

May 01,03,09,21,27,31 08:00-21:00

It is a simplification of what I found here.

Why is this a valid rule?
According to the specification, it shouldn’t be possible to have multiple monthdays after a month, but the evaluation tool works with it, and that wiki editor also said it is valid.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/opening-hours-rules-why-is-it-possible-to-specify-multiple-monthdays-after-a-month/1515