[R-pkgs] new version of package declared

[Adrian Dușa]

Dear R-list,

It gives me great pleasure to announce the release of version 0.18 of
package declared, that makes a difference between empty missing values (the
current NAs in R) and declared missing values (NAs with a reason).

Besides an automatic detection of such values by most base R operations
(including ==, != etc.), package declared also offers weighted versions of
most common summaries (ex. mean, median, sd, quantile) that also apply on
the declared missing values, something not covered by other similar
functions.

Version 0.18 is fully documented using Roxygen2 and extensively (even
obsessively) tested to achieve no less than 100% code coverage, using more
than 750 tests including the "golden" ones capturing output using
snapshots. It also features three Vignettes showcasing the package's
features.

Many thanks to Daniel Antal for the enthusiastic support and contribution
to the initial Roxygen2 and pkgdown documentation, bringing this package
closer to the rOpenSci standards. Most functions are now generic, allowing
extensions to any type of object, for both creation and coercion to class
"declared".

Platform specific binaries are soon to be built on CRAN, but they are also
available and can be installed from R-universe package page:
https://dusadrian.r-universe.dev/ui#package:declared

As always, bug reporting and feature proposals are more than welcome.
Adrian

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