For what it's worth, the current title of this submission is "JavaScript has multiple (ambiguous) operator precedence chains", which is made up by the submitter

For what it's worth, the current title of this submission is "JavaScript has multiple (ambiguous) operator precedence chains", which is made up by the submitter. I question the use of a word "ambiguous" here, because it really sounds like that JS somehow had two precedence chains and had to resolve them. Absolutely not. But it's correct that the programmer intent would be indeed ambiguous, hence that error message.