François Pantigny submitted an update to the
nicematrix
package.
Version number: 5.13 2021-03-23 License type: lppl1.3
Summary description: Improve the typesetting of mathematical matrices with PGF
Announcement text: ----------------------------------------------------------------------
New command arraycolor in the CodeBefore (with its key 'except-corners').
New key 'borders' for the command Block.
New command Hline (for horizontal rules not drawn in the blocks).
The keys 'vlines' and 'hlines' take in as value a (comma-separated) list of numbers (for the rules to draw). ----------------------------------------------------------------------
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Thanks for the upload.
For the CTAN Team Ina Dau