chore: add warning log when exceeding max number of pairs #2035

Job	Run time
lint	35s
test (ubuntu-latest, stable)	2m 6s
test (ubuntu-latest, beta)	1m 42s
test (ubuntu-latest, 1.65.0)	2m 10s
test (macos-latest, stable)	1m 17s
cargo-deny (aarch64-apple-ios)	21s
test (macos-latest, beta)	1m 20s
cargo-deny (aarch64-linux-android)	19s
test (macos-latest, 1.65.0)	1m 26s
cargo-deny (i686-pc-windows-gnu)	21s
test (windows-latest, stable)	3m 53s
cargo-deny (i686-pc-windows-msvc)	21s
test (windows-latest, beta)	3m 18s
cargo-deny (i686-unknown-linux-gnu)	18s
test (windows-latest, 1.65.0)	3m 37s
cargo-deny (wasm32-unknown-unknown)	17s
cargo-deny (x86_64-apple-darwin)	17s
cargo-deny (x86_64-apple-ios)	20s
cargo-deny (x86_64-pc-windows-gnu)	17s
cargo-deny (x86_64-pc-windows-msvc)	17s
cargo-deny (x86_64-unknown-linux-gnu)	20s
cargo-deny (x86_64-unknown-redox)	21s
	25m 13s

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