Convert an Operand to a String

When one of the two operands is not a string, it is converted to a String as follows:

  • an operand whose type is a primitive type is converted as if by calling toString() on the boxed value.
  • an operand whose type is a reference type is converted by calling the operand’s toString() method.
  • if the operand is null, or if the toString() method returns null, then the string literal “null” is used instead.
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