2445: DTSTART and DTEND (and DUE)

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Newsgroups gmane.ietf.calendar
Message-ID <[email protected]>
if DTSTART is of type DATE then DTEND must be also be of type DATE;
is the reverse true (must these two always match in type)?

none of these rules are stated for DTSTART and DUE (for VTODO),
are the rules that apply to DTSTART/DTEND meant to apply to DTSTART/DUE?
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