Properly drop overwritten ex data #620

Job	Run time
Test FIPS integration	2m 48s
Test (stable)	2m 1s
Test (macos-x86_64)	3m 55s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	6m 29s
clippy	2m 29s
Test (arm-android)	1m 56s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	2m 33s
Test (arm64-android)	2m 16s
Test (i686-android)	2m 9s
rustfmt	11s
Test features	3m 7s
Test (x86_64-android)	2m 1s
Test (aarch64-ios)	3m 47s
Test (aarch64-ios-sim)	5m 7s
Test (x86_64-ios)	5m 20s
Test (i686-linux)	2m 3s
Test (arm-linux)	2m 5s
Test (aarch64-linux)	2m 8s
Test (x86_64-musl)	2m 6s
Test (x86_64-mingw)	2m 12s
Test (i686-msvc)	4m 56s
Test (x86_64-msvc)	4m 43s
	1h 6m 22s

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