Message 365907 - Python tracker

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Content
As discussed briefly in Mark's PR, benchmarks like this are now slower:

    ret = dict(**{'a': 2, 'b': 4, 'c': 6, 'd': 8})


Python 3.8: Mean +- std dev: 281 ns +- 9 ns
    master: Mean +- std dev: 456 ns +- 14 ns