Test with C-extensions

add BaseAttrib.discard_mtext() method #2050

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Run time

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Job	Run time
build (3.9)	1m 44s
build (3.10)	1m 35s
build (3.11)	1m 26s
build (3.12)	1m 37s
build (3.13)	1m 43s
	8m 5s