MixConfig: fit data with the mixing of config #693

Job	Run time
conda install latest tensorflow (ubuntu-22.04)	4m 36s
conda install (ubuntu-22.04)	2m 56s
Unit tests (ubuntu-22.04, 3.10)	17m 37s
Build documentation	4m 31s
Unit tests (macos-latest, 3.11)	9m 26s
Compatibility Testing (ubuntu-20.04, 3.6)	15m 0s
Test uproot3 (ubuntu-22.04, 3.10)	16m 42s
Unit tests (ubuntu-22.04, 3.7)	16m 44s
Style checks	2m 16s
Unit tests (ubuntu-22.04, 3.11)	17m 10s
Coverage (ubuntu-22.04, 3.10)	36s
	1h 47m 34s

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