cms

der: have `Reader::peek*` methods take `&mut self` (#1418) #1197

Job	Run time
build (1.75.0, thumbv7em-none-eabi)	36s
build (1.75.0, wasm32-unknown-unknown)	32s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	33s
minimal-versions	0s
test (1.75.0)	3m 1s
test (stable)	2m 41s
	7m 47s

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