build_tsibble_meta() does much less checks than build_tsibble() for
high performance.
build_tsibble_meta(x, key_data = NULL, index, index2, ordered = NULL,
interval = TRUE)A data.frame, tbl_df, tbl_ts, or other tabular objects.
A data frame containing key variables and .rows. When a data
frame is supplied, the argument key will be ignored.
Strings for variable name.
The default of NULL arranges the key variable(s) first and
then index from past to future. TRUE suggests to skip the ordering as x in
the correct order. FALSE checks the ordering and may give a warning.
TRUE automatically calculates the interval, and FALSE for
irregular interval. Use the specified interval via new_interval() as is.