lvjr

I decide to provide commands `\DefTblrInnerKey` and `\DefTblrOuterKey` in the near future. Or maybe I only need to provide one command: ```latex \DefTblrMetaKey{inner}{keya}{some specs} \DefTblrMetaKey{outer}{keyb}{other specs} ```

Thanks. Floats are complicated. I think I need to learn more first.

Very nice! Now it is much clearer.

Some related questions on TeX.SE: https://tex.stackexchange.com/questions/610595/table-with-header-row-of-normal-height-remaining-rows-fill-page-vertically-tab https://tex.stackexchange.com/questions/610975/whole-page-strikethrough-with-variable-length https://tex.stackexchange.com/questions/614245/tabularx-vfill-in-column-to-fill-rest-of-page https://tex.stackexchange.com/questions/632161/non-breaking-vertical-space-between-a-table-and-a-block-of-text

Oh, there is already a `\rulewidth` variable used in source code.

Maybe the interface could be ``` rules = {fg=brown, wd=1pt} ``` See also issue https://github.com/lvjr/tabularray/issues/172.

Recently I has been considering a `bg` key for `hborder` and `vborder`. It will cover all three cases: doublerule sep color, dashed lines background color, and border text background color...

`hborder` is the rectangle canvas on which we draw hlines and write text. And neither normal or trimmed hlines will affect the color of canvas.

> Could this `bg` key also fix #215 ? I don't think so. It is another problem.

It is not that natural to set colors in `hborder`/`vborder`. To provide similar interfaces as those in `colortbl`, I think it would be better to extend the existing `rulesep` key...