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The JavaDoc of flatten says: "This collection and any nested collections have their contents (recursively) added to the new collection." However, if it encounters a map, it exacts the value list and flattens that. This is odd on two points – 1) a Map is not a Collection, so it shouldn't be touched by #flatten according to that definition, and 2) there is no map#flatten which corresponds to this behavior.
This makes it sound like a bug to me, but there may be existing code dependent on the issue. So the attached patches just document and demonstrate the issue.
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Description
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The JavaDoc of flatten says: "This collection and any nested collections have their contents (recursively) added to the new collection." However, if it encounters a map, it exacts the value list and flattens that. This is odd on two points – 1) a Map is not a Collection, so it shouldn't be touched by #flatten according to that definition, and 2) there is no map#flatten which corresponds to this behavior.
This makes it sound like a bug to me, but there may be existing code dependent on the issue. So the attached patches just document and demonstrate the issue. |
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Test
Closed
Major
[ [a:1, b:2, c:3] ].flatten() -> [ 1, 2, 3 ]
