prealloc children (#1) #7

Job	Run time
docs	13s
clippy	18s
miri --no-default-features	41s
feature-checks	8s
miri	42s
miri --all-features	1m 26s
test stable --no-default-features	17s
fmt	14s
test stable	18s
test stable --all-features	36s
test beta --no-default-features	14s
test beta	15s
test beta --all-features	18s
test nightly --no-default-features	18s
test nightly	18s
test nightly --all-features	31s
test 1.65 --no-default-features	20s
test 1.65	19s
test 1.65 --all-features	35s
	8m 1s

Provide feedback