[mono] Fix downcast check in Array.CopySlow #64469
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where each element in the source array is the appropriate type
When we have to resort to checking element by element, compare the type of each actual element with the destination type. In particular, not the destinations underlying type when it's an enum - we don't want to allow unrelated enums using the same representation to copy over. Fixes dotnet#64387
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/cc @lewing |
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/backport to release/6.0 |
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Started backporting to release/6.0: https://github.com/dotnet/runtime/actions/runs/1764177051 |
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When we have to resort to checking element by element, compare the type of each actual element with the destination type. In particular, not the destinations underlying type when it's an enum - we don't want to allow unrelated enums using the same representation to copy over.
Fixes #64387