Is it more clear to use !booleanVariable, or booleanVariable == false?

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I'm unsure how it is done in the workplace. I've worked on two open source projects whereby the owner of one said to always do ! before booleans, because he said humans read it like "if not condition", whereby the variable is usually a true value from it's name (ex: isRed, livesForever, canEat...etc) therefore reading more like English (ex: He is not red).

On another project, the owner said he only wants to see == false because the ! is hard to see and your intention is more clear.

While both methods work and it can be a choice of preference, is there one that dominates in the workplace?

Is ! considered bad practice due to the chance a user may find it possibly harder to spot than == false?

asked 36 secs ago

Water

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Is it more clear to use !booleanVariable, or booleanVariable == false?