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“Should” has a very precise technical meaning in standards. Mentally it’s best to replace it with “MUST” (they are equivalent).

"Must" is equivalent to required, "should" is equivalent to recommended, so not at all the same.

True enough. I was conflating “should” with “shall” which is definitionally equal to “must”. The edit window has elapsed or I’d correct it.

True enough; however, when the behavior after the should isn't properly specified...