Changes in version 2.2.0                        

  - BREAKING CHANGE: the argument grid.only= has been changed to
    grid_only= for consistency with other arguments.

  - Improved performance for time_varying() and check_tv_exposure() by
    using dplyr::join_by(). In particular, the latter now allows for
    much larger data sets to have overlaps checked.

                        Changes in version 2.1.0                        

  - Added an error to detect when parallel::mcMap() has an error in one
    of its forked processes.

  - Added parallelly::availableCores(omit = 1) as the new default for
    n_cores=.

                 Changes in version 2.0.2 (2024-02-16)                  

  - tv::time_varying() gained a sort= argument, to warn the user that
    things ought to be sorted when x$datetime is a Date.

  - Added Peter Martin as a contributor, as he inspired the v2.0.0
    rewrite.

                        Changes in version 2.0.1                        

  - The previous version of tv (< 2.0.0) accidentally silently dropped
    exposures that had zero (or negative) length. In 2.0.0 this became a
    non-informative error. It now has an informative error.

                 Changes in version 2.0.0 (2023-10-31)                  

  - Completely overhauled the internals, for a decent speed boost. In
    dense data, the speed up in practice is on the order of ~2x. In
    sparse data, the speed up has been witnessed as high as ~25x.

                 Changes in version 1.7.3 (2023-10-06)                  

  - Added return values to the documentation and resubmitted to CRAN.

                        Changes in version 1.7.2                        

  - Submit to CRAN.

                        Changes in version 1.7.1                        

  - Added logic to tv_min(), tv_max(), et al. to handle cases where
    there are relevant rows for the feature, but which are all missing.
    Usually you will want to filter these NA rows out a priori, because
    they're almost never what you want.

                        Changes in version 1.7.0                        

  - Added grid.only= argument to time_varying().

  - Thank you, dplyr for changing your minds. Enforce dplyr (>= 1.1.1).

  - Added a "How does this actually work" section to the vignette.

                        Changes in version 1.6.1                        

  - Added multiple = 'all' to one dplyr::inner_join() and one
    dplyr::left_join().

                        Changes in version 1.6.0                        

  - Aggregations are now checked to make sure they exist. This includes,
    in particular, when the aggregation is NA.

  - Removed a few imports from the DESCRIPTION that weren't being used.

                        Changes in version 1.5.0                        

  - Changed the default number of cores to check if
    "SLURM_CPUS_PER_TASK" is defined.

                        Changes in version 1.4.0                        

  - The exposures are now expected to be non-overlapping (although
    windows can touch when a start time equals an end time).

                        Changes in version 1.3.0                        

  - Reorganized the help pages.

  - Added special behavior for when "lookback_end" or "lookback_start"
    are NA.

  - The grid now includes "exposure_start" and "exposure_stop".

  - Added aggregation option "tv_median".

  - Added tests with testthat.

                        Changes in version 1.2.3                        

  - Updated vignette.

  - Forced warnings to be printed as they occur, instead of when
    tv::time_varying() finishes.

                        Changes in version 1.2.2                        

  - Added the aggregation option "sum".

                        Changes in version 1.2.1                        

  - Fixed an error message.

                        Changes in version 1.2.0                        

  - Added an attribute denoting what type of column each of the
    resulting columns is. This is useful for subsetting for, e.g.,
    xgboost.

                        Changes in version 1.1.0                        

  - Added id= argument.

                        Changes in version 1.0.0                        

  - Initial port of code from kernds, removing all kds prefixes.