Add an assertion to resolve a typing error #112

Job	Run time
windows (windows-11-arm, aarch64, arm64)	1m 46s
musllinux (ubuntu-22.04, armv7)	1m 25s
sdist	15s
musllinux (ubuntu-22.04, x86_64)	1m 34s
windows (windows-latest, x86, x86)	2m 23s
macos (macos-15-intel, x86_64)	1m 8s
musllinux (ubuntu-22.04, aarch64)	1m 29s
macos (macos-latest, aarch64)	31s
windows (windows-latest, x64, x64)	2m 54s
linux (ubuntu-22.04, ppc64le)	1m 39s
linux (ubuntu-22.04, x86_64)	1m 22s
linux (ubuntu-22.04, armv7)	1m 58s
musllinux (ubuntu-22.04, x86)	1m 29s
linux (ubuntu-22.04, aarch64)	2m 7s
linux (ubuntu-22.04, x86)	2m 1s
linux (ubuntu-22.04, s390x)	1m 48s
Release	-1s
	25m 48s

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