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use generics in traits rather than 'dyn traits' #206

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Job	Run time
cargo-deny	20s
lint	31s
docs	24s
format	10s
test (msrv)	42s
test (stable)	42s
test (nightly)	46s
test (macos)	1m 39s
test (windows)	1m 37s
dependabot	0s
	6m 51s