Manual missing for GTabularize

[19000]

It took me a while to find this functionality in the source: GTabularize.
Why not include it in the doc?

GTabularize /pattern[/format] {{{2
GTabularize name

Align text on only matching lines, either using the given pattern, or the
command associated with the given name. Mnemonically, this is similar to
the :global command, which takes some action on all rows matching a pattern
in a range. This command is different from normal :Tabularize in 3 ways:

1. If a line in the range does not match the pattern, it will be left
   unchanged, and not in any way affect the outcome of other lines in the
   range (at least, normally - but Pipelines can and will still look at
   non-matching rows unless they are specifically written to be aware of
   tabular#DoGTabularize() and handle it appropriately).
2. No automatic range determination - :Tabularize automatically expands
   a single-line range (or a call with no range) to include all adjacent
   matching lines. That behavior does not make sense for this command.
3. If called without a range, it will act on all lines in the buffer (like
   :global) rather than only a single line