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S3 method to add an index type support for a tsibble.
index_valid(x)
An object of index type that the tsibble supports.
TRUE/FALSE or NA (unsure)
TRUE
FALSE
NA
This method is primarily used for adding an index type support in as_tsibble.
pull_interval for obtaining interval for regularly spaced time.
# NOT RUN { index_valid(seq(as.Date("2017-01-01"), as.Date("2017-01-10"), by = 1)) # }
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