Isn't it this?(Bold text quoted)
The singular addition operator evaluates the operand before the operand, but tries to convert non-numeric values to numeric values. The singular negative (-) can also convert non-numeric values, but it is the fastest way to convert any value to numeric values.Supports integers in decimal and hexadecimal notation (prefix "0x").Negative numbers are also supported (except hexadecimal).If individual values cannot be interpreted, they are evaluated to NaN.
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