Document why you can't use date_trunc("week") on intervals.
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@ -7050,6 +7050,11 @@ date_trunc('<replaceable>field</replaceable>', <replaceable>source</replaceable>
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</simplelist>
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</simplelist>
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</para>
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</para>
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<para>
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<literal>week</literal> is not supported for <type>interval</>
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values because months usually have fractional weeks.
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</para>
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<para>
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<para>
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Examples:
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Examples:
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<screen>
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<screen>
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