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Fix overly strict sendability checks #1673

Job	Run time
Tests / cargo-clippy	44s
Tests / cargo-deny	33s
Tests / cargo-fmt	19s
Tests / amd64-linux-gnu compiler	1m 3s
Tests / inko-fmt	58s
Tests / amd64-linux-musl compiler	2m 2s
Tests / vale	8s
Tests / amd64-freebsd-native compiler	2m 32s
Tests / amd64-freebsd-native std	4m 20s
Tests / amd64-mac-native compiler	2m 4s
Tests / amd64-linux-gnu std --opt=none	1m 43s
Tests / arm64-mac-native compiler	1m 32s
Tests / amd64-mac-native std --opt=none	2m 36s
Tests / amd64-linux-musl std --opt=none	1m 47s
Tests / arm64-mac-native std --opt=none	35s
Tests / amd64-linux-gnu std --opt=balanced	1m 47s
Tests / amd64-mac-native std --opt=balanced	2m 37s
Tests / amd64-linux-musl std --opt=balanced	1m 47s
Tests / arm64-mac-native std --opt=balanced	2m 20s
Nightly container	0s
Standard library documentation	0s
Documentation	0s
	31m 27s

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