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Fix unsized fields usage in `Display`/`Debug` derives (#440, #432) #1065

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Job	Run time
rustfmt	13s
clippy	25s
MSRV (1.75.0, ubuntu)	47s
no_std	16s
MSRV (1.75.0, macOS)	49s
test features (std)	54s
MSRV (1.75.0, windows)	1m 34s
test (ubuntu, stable)	49s
test features (no_std)	58s
rustdoc	17s
test (ubuntu, nightly)	34s
rustdoc (private)	18s
test (macOS, stable)	51s
test (macOS, nightly)	54s
test (windows, stable)	1m 28s
test (windows, nightly)	1m 20s
release (GitHub)	0s
	12m 27s