ancient append vec append creates big enough ancient append vecs (#34… #448

Job	Run time
ios (macos-11, aarch64-apple-ios)	6m 22s
android (ubuntu-20.04, x86_64-linux-android)	3m 6s
ios (macos-11, x86_64-apple-ios)	6m 15s
android (ubuntu-20.04, aarch64-linux-android)	3m 4s
ios (macos-11, aarch64-apple-darwin)	5m 50s
android (ubuntu-20.04, i686-linux-android)	2m 59s
ios (macos-11, x86_64-apple-darwin)	5m 49s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 16s
error_reporting	0s
	36m 41s

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