Linus Groh a1b820b11c LibJS: Improve UpdateExpression::execute() ...

- Let undefined variables throw a ReferenceError by using
  Identifier::execute() rather than doing variable lookup manually and
  ASSERT()ing
- Coerce value to number rather than ASSERT()ing
- Make code DRY
- Add tests

2020-04-22 13:09:59 +02:00

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