Handle raw legacy type variables in `is_subset_eq` #4502

Job	Run time
get_version	33s
build_extension (windows-latest, win32, x64, $env:GITHUB_ENV)	12m 34s
build_extension (windows-latest, win32, arm64, $env:GITHUB_ENV)	11m 32s
build_extension (ubuntu-latest, linux, x64, x86_64-unknown-linux-musl, $GITHUB_ENV)	6m 24s
build_extension (ubuntu-latest, alpine, x64, x86_64-unknown-linux-musl, $GITHUB_ENV)	6m 11s
build_extension (ubuntu-24.04-arm, linux, armhf, ubuntu:20.04, $GITHUB_ENV)	7m 20s
build_extension (macos-15-intel, darwin, x64, x86_64-apple-darwin, $GITHUB_ENV)	13m 53s
build_extension (macos-14, darwin, arm64, $GITHUB_ENV)	5m 53s
build_extension (ubuntu-24.04-arm, alpine, arm64, ubuntu:20.04, $GITHUB_ENV)	7m 37s
build_extension (ubuntu-24.04-arm, linux, arm64, ubuntu:20.04, $GITHUB_ENV)	7m 0s
	1h 18m 57s

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