Civi upgrade to 5.46, using civiexportexcel 2.2
FWIW, it was an upgrade from 5.35 and generated this error:
Fatal error: Cannot redeclare Matrix\adjoint() (previously declared in /var/www/html/sites/all/modules/civicrm/vendor/markbaker/matrix/classes/src/Functions/adjoint.php:21) in /var/www/html/sites/default/civicrm_ext/ca.bidon.civiexportexcel/vendor/markbaker/matrix/classes/src/functions/adjoint.php on line 20
Updating to civiexportexcel to 2.3 resolved it.
No action required, just posting this in case it's helpful to anyone else.
As an aside - the issue of packaging vendor libraries with extensions seems to be a continuing challenge!
If 2.3 has come up with a way to solve it, notes welcomed.