The repend word works in the same way as append, but repend first evaluates (or reduces—the re comes from reduce) the series to be added:
repend [10 11 12] [8 + 5 "pi"] ;== [10 11 12 13 "pi"]
As always, with /only, the added series stays a series:
repend/only [10 11 12] [8 + 5 "pi"] ;== == [10 11 12 [13 "pi"]]
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