Fix unreliable ordering when specializing types #1206

Job	Run time
Tests / cargo-clippy	48s
Tests / cargo-deny	33s
Tests / vale	15s
Tests / cargo-fmt	21s
Tests / amd64-freebsd-native	4m 25s
Tests / amd64-linux-gnu	2m 1s
Tests / amd64-linux-musl	2m 46s
Tests / amd64-mac-native	3m 17s
Tests / arm64-mac-native	1m 50s
Tests / inko-fmt	54s
Standard library documentation	1m 51s
Nightly container	35s
Documentation	1m 4s
	20m 40s

Provide feedback