;lib:spanExtend: improve doc
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@ -399,9 +399,11 @@ spanValidDefaultsFrom s1 s2 =
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-- DateSpan ..2024-12-31
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spanUnion (DateSpan b1 e1) (DateSpan b2 e2) = DateSpan (earlier b1 b2) (later e1 e2)
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-- | Extend the first span to include any definite end dates of the second.
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-- Unlike spanUnion, open ends in the second are ignored.
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-- If the first span was open-ended, it still will be after being extended.
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-- | Extend the definite start/end dates of the first span, if needed,
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-- to include the definite start/end dates of the second span.
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-- And/or, replace open start/end dates in the first span with
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-- definite start/end dates from the second.
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-- Unlike spanUnion, open start/end dates in the second are ignored.
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--
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-- >>> ys2024 = fromGregorian 2024 01 01
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-- >>> ys2025 = fromGregorian 2025 01 01
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