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toUpperCase and toLowerCase should use the full case mapping. #6706

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This issue was originally filed by erik.co...@gmail.com


Currently the VM uses simple case mapping where Straße -> STRAßE, whereas dart2js inherits the full case mapping from JavaScript where Straße -> STRASSE. We should determine which mapping should be used and implement it consistently.

There is a test for this: corelib/unicode_test.dart

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    area-vmUse area-vm for VM related issues, including code coverage, and the AOT and JIT backends.type-bugIncorrect behavior (everything from a crash to more subtle misbehavior)

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