all the strings are Unicode in Python3 (#562) #249

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Job	Run time
build (3.7)	3m 36s
build (3.8)	3m 40s
build (3.9)	3m 51s
build (3.10)	3m 44s
build (3.11)	3m 39s
build (3.12)	3m 43s
build (pypy3.10)	3m 58s
	26m 11s