Today I Learned: I can achieve the effect of map:put($m, $k, $v) with map:merge(($m, map{$k: $v})). The benefit of map:merge is that the sequence of maps may contain an empty sequence. If $m is the empty sequence, the map:merge still succeeds. points out that map:merge#1 only succeeds if the key is not already in the map -- thus it should better be map:merge((map{$k: $v}, $m))

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