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Yes

function throwErr() public {
require(err === true, "0");
}

if not truefalse, 0 will be displayed as the error message.

Yes

function throwErr() public {
require(err = true, "0");
}

if not true, 0 will be displayed as the error message.

Yes

function throwErr() public {
require(err == true, "0");
}

if false, 0 will be displayed as the error message.

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Yes

function throwErr() public {
require(err = true, "0");
}

if not true, 0 will be displayed as the error message.