patch 8.2.3481: failures when char is unsigned Commit: https://github.com/vim/vim/commit/2e258bd79f403bcccb1336bea70803957a83808f Author: James McCoy <jamessan@jamessan.com> Date: Tue Oct 5 19:44:04 2021 +0100 patch 8.2.3481: failures when char is unsigned Problem: Failures when char is unsigned. Solution: Use int8_T. Make a CI run with unsigned char. (James McCoy, closes #8936)

|f+0&#ffffff0|o@1| |1| @64
|f|o@1| |2| @64
|f|o+1&&|o+0&&| |3| @64
|f|o@1| |4| @64
|f|o@1| |5| @64
|f|o@1| |6| @64
|f|o@1| |7| @64
|f|o@1| |8| @64
|/|\|v> @66