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Comment by quesera | Hacker News Reader

I think it's fairly common.

  NO_COLOR=1
  NO_COLOR=true
  NO_COLOR=yes

Rather than parsing all the permutations, the usual evaluation of env vars that are expected to hold a boolean type is just the equivalent of:

  #ifdef NO_COLOR

Well, in ZSH [[ -v VAR ]] can actually differentiate between unset and null variables

And

NO_COLOR=

would lead to an non-intuitive behavior

I think the implication is that it should have a value.