For some packages (in particular the code DRA), all allocator implementations
can handle the testcases. Some other packages are for less stable features and
work with fewer implementations. Now all unit tests are run with all suitable
implementations, to increase code coverage.
Benchmarks are fixed to the most mature implementation because they would be
costly to run in more than one. When promoting an allocation implementation we
can do before/after comparisons to detect potential performance regressions.
The downside of this approach is that we need to remember to extend the list
of supported implementations when promoting features, otherwise testing will miss
some new supported implementation.
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