feat: add world (#101) #359

Job	Run time
clippy	19s
feature-checks	1m 6s
fmt	14s
docs	17s
miri --no-default-features	37s
wasm	26s
miri	37s
test stable --no-default-features	29s
miri --all-features	59s
test stable	24s
test stable --all-features	36s
test beta --no-default-features	14s
test beta	15s
test beta --all-features	31s
test nightly --no-default-features	28s
test nightly	20s
test nightly --all-features	28s
test 1.79 --no-default-features	18s
test 1.79	18s
	8m 56s

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