surf: Open Diff to custom construction #700

Job	Run time
build-macos	2m 26s
build-windows	4m 47s
cargo-deny (advisories)	26s
cargo-deny (bans licenses sources)	26s
build-linux (stable)	1m 50s
build-linux (nightly)	2m 28s
fmt	29s
docs	1m 27s
lint	1m 30s
test-linux (stable)	6m 28s
test-linux (nightly)	8m 22s
test-macos	14m 45s
	45m 24s

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