Flexible builder extension and type signature API #532

Job	Run time
cargo-fmt	26s
cargo-lock	7s
cargo-doc (ubuntu)	32s
cargo-doc (windows)	2m 19s
cargo-miri	1m 36s
cargo-doc (macos)	42s
compilation-benchmarks	3m 3s
cargo-machete	4s
runtime-benchmarks (args_3)	1m 19s
test-msrv (ubuntu)	58s
runtime-benchmarks (args_5)	1m 19s
test-stable (ubuntu)	1m 34s
test-msrv (windows)	1m 56s
taplo-fmt	5s
runtime-benchmarks (args_10_alloc)	1m 16s
test-stable (windows)	3m 58s
test-msrv (macos)	1m 4s
runtime-benchmarks (args_10_structs)	1m 40s
test-stable (macos)	1m 42s
runtime-benchmarks (args_10)	1m 30s
test-unstable (beta)	40s
runtime-benchmarks (args_20)	1m 21s
typos	7s
test-unstable (nightly)	39s
website-build	26s
	30m 23s

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