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S3 method to add an index type support for a tsibble.
index_valid(x)
TRUE/FALSE or NA (unsure)
TRUE
FALSE
NA
An object of index type supported by tsibble.
This method is primarily used for adding an index type support in as_tsibble.
interval_pull for obtaining interval for regularly spaced time.
index_valid(seq(as.Date("2017-01-01"), as.Date("2017-01-10"), by = 1))
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