(tps1 <- as_types(c("a", "simple", "simple", "example")))
(tps2 <- as_types(c("with", "a", "few", "words")))
(tps3 <- as_types(c("just", "for", "testing")))
types_merge(tps1, tps2) # always removes duplicates, but doesn't sort
sort(types_merge(tps1, tps2)) # same, but with sorting
types_merge_all(tps1, tps2, tps3)
types_merge_all(list(tps1, tps2, tps3))
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