Data offloaded and inlined at the same time

In MR !216 (merged) a new feature was added. It is supposed to either inline or offload a parameter value.

Now, with using the master branch, with this datastore configuration:

type: gridfs
inline-threshold: 1
compress: false

and this model a = 1; b = a I see that the value of a was incorrectly written to the launch of the firework processing a = 1:

"update_spec": {
    "a": {
        "value": {
            "data": [
                1,
                []
            ],
            "_fw_name": "{{virtmat.language.utilities.serializable.FWQuantity}}"
        },
        "datastore": {
            "path": ".fireworks/vre-language-datastore",
            "type": "gridfs",
            "format": "json",
            "name": "vre_language_datastore",
            "launchpad": null,
            "compress": false,
            "inline-threshold": 1
        },
        "filename": "a6527ba30a094caf856af1727ea1f3f6.json",
        "_fw_name": "{{virtmat.language.utilities.serializable.FWDataObject}}"
    }
}

There should be no key value in a, only datastore and filename. Then, the same dictionary for a is copied to the spec of the firework processing b = a. Of course, in this small example the bug is not visible. It is rendered when using parameters with high memory allocation.