Merge Time Indexed Series
Merge two time-indexed series using either the levels or the first differences of the second series where the series overlap.
y must have the same
tif (ti frequency),
and the same number of column (if they are multivariate).
tis object series with start and end dates that span those of
y. Where the series overlap, values from
are used, except that if
y do not overwrite non-
NA values in
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