reduce memory overhead on list

Author: pchalamet

FSharp.MongoDB.Driver/Serializers/List.fs

@@ -5,12 +5,12 @@ open MongoDB.Bson.Serialization
 type internal ListSerializer<'T>() =
     inherit SerializerBase<List<'T>>()
 
-    let contentSerializer = BsonSerializer.LookupSerializer(typeof<'T[]>)
+    let contentSerializer = BsonSerializer.LookupSerializer(typeof<System.Collections.Generic.IEnumerable<'T>>)
 
     override _.Serialize(context, _, value) =
-        let list = value |> List.toArray
+        let list = value
         contentSerializer.Serialize(context, list)
 
     override _.Deserialize(context, args) =
-        let list = contentSerializer.Deserialize(context, args) :?>'T[]
-        list |> List.ofArray
+        let list = contentSerializer.Deserialize(context, args) :?> System.Collections.Generic.IEnumerable<'T>
+        list |> List.ofSeq

FSharp.MongoDB.Driver/Serializers/Map.fs

@@ -14,4 +14,3 @@ type internal MapSerializer<'K, 'V when 'K : comparison>() =
     override _.Deserialize(context, args) =
         let dict = contentSerializer.Deserialize(context, args) :?> System.Collections.Generic.IDictionary<'K, 'V>
         dict |> Seq.map (|KeyValue|) |> Map.ofSeq
-