[tz] Am I missing an implicit rule?

[Grilled Chipolatas]

Hello,

I have been working with the database lately and have had issues to read
Morocco rules. I tried to look in the archives of the mailing list but
didn't find my answer.

Currently the database contains these bits:

Rule    Morocco    2017    only    -    Jul     2     2:00    1:00    -
Rule    Morocco    2018    only    -    May    13     3:00    0    -
Rule    Morocco    2018    only    -    Jun    17     2:00    1:00    -
Rule    Morocco    2019    only    -    May     5     3:00    -1:00    -
Rule    Morocco    2019    only    -    Jun     9     2:00    0    -

# Zone    NAME        GMTOFF    RULES    FORMAT    [UNTIL]
Zone Africa/Casablanca    -0:30:20 -    LMT    1913 Oct 26
             0:00    Morocco    +00/+01    1984 Mar 16
             1:00    -    +01    1986
             0:00    Morocco    +00/+01    2018 Oct 28  3:00
             1:00    Morocco    +01/+00

I wonder if the database should add this rule dated to the switching to
permanent DST:
Rule    Morocco    2018    only    -    Oct    28     3:00    0    -

Or am I missing an implicit rule: being that a new zone change discard any
current rule
(here Morocco   2018    only    -    Jun    17     2:00    1:00    - )?

Thanks for any clarification,

Maxime Vinzio
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