Make sure that JSON is serialized when writing.
Make sure that JSON is serialized when writing.

chunmun/tree-builder-builder,dglazkov/tree-builder-builder,chunmun/tree-builder-builder,loyso/tree-builder-builder,loyso/tree-builder-builder,loyso/tree-builder-builder,dglazkov/tree-builder-builder,chunmun/tree-builder-builder,dglazkov/tree-builder-builder