Stdlib case mapping differs from latest stable node

[dcodeIO]

Affected code points are

origLowerCode != expectLowerCode 42951
  origLowerCode = 18446744069414561735
  expectLowerCode = 18446744069414561736

origUpperCode != expectUpperCode 42952
  origUpperCode = 18446744069414561736
  expectUpperCode = 18446744069414561735

origLowerCode != expectLowerCode 42953
  origLowerCode = 18446744069414561737
  expectLowerCode = 18446744069414561738

origUpperCode != expectUpperCode 42954
  origUpperCode = 18446744069414561738
  expectUpperCode = 18446744069414561737

origLowerCode != expectLowerCode 42997
  origLowerCode = 18446744069414561781
  expectLowerCode = 18446744069414561782

origUpperCode != expectUpperCode 42998
  origUpperCode = 18446744069414561782
  expectUpperCode = 18446744069414561781

Looks like something changed in node's v8 version recently. Tested with node v13.12.0, while earlier versions appear to be fine. cc @MaxGraey

[MaxGraey]

Yeah, node.js updated unicode to latest 13.0.0 (we use 12.1.0 currently): nodejs/node@74e7e72