Resolves #135: DocLayer is not able to handle sparse arrays correctly. #165
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Previously, the null imputing logic used when doing path expansion is not handling the sparse array at all. This PR mainly resolves that problem by adding a third case when it impute a null value. This PR also fixed several bugs in MongoModel.
Regarding to the sparse array: right now in
insertElementRecursive()
, DocLayer does NOT try to store arrays with null values as sparse arrays, which is kind of against what it attempts to do later when doing update. Filed #164 tracking that.