Document collections

Author: Tarmil

README.md

@@ -102,6 +102,52 @@ type MyHub() =
 
 ## Format
 
+### Lists
+
+F# lists are serialized as JSON arrays.
+
+```fsharp
+JsonSerializer.Serialize [1; 2; 3]
+// --> [1,2,3]
+```
+
+### Sets
+
+F# sets are serialized as JSON arrays.
+
+```fsharp
+JsonSerializer.Serialize (Set [1; 2; 3])
+// --> [1,2,3]
+```
+
+### Maps
+
+F# string-keyed maps are serialized as JSON objects.
+
+```fsharp
+JsonSerializer.Serialize (Map [("a", 1); ("b", 2); ("c", 3)])
+// --> {"a":1,"b":2,"c":3}
+```
+
+Maps with other types as keys are serialized as JSON arrays, where each item is a `[key,value]` array.
+
+```fsharp
+JsonSerializer.Serialize (Map [(1, "a"); (2, "b"); (3, "c")])
+// --> [[1,"a"],[2,"b"],[3,"c"]]
+```
+
+### Tuples
+
+Tuples and struct tuples are serialized as JSON arrays.
+
+```fsharp
+JsonSerializer.Serialize ((1, "abc"))
+// --> [1,"abc"]
+
+JsonSerializer.Serialize (struct (1, "abc"))
+// --> [1,"abc"]
+```
+
 ### Records and anonymous records
 
 Records and anonymous records are serialized as JSON objects.