Bug#1014008: coreutils: comm --output-delimiter= (empty) separates with a single NUL, not the empty string, vice versa for --total

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retitle -1 1014008 coreutils: comm --output-delimiter= (empty) separates with a 
single NUL, not the empty string, vice versa for --total
thanks

The only thing suitable for posting is "lmao". As the title says:
  $ comm   --total  --output-delimiter= <(echo a; echo b) <(echo a) | cat -A
  ^@^@a$
  b$
  101total$

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