Validate serialized length of modified objects in the Variable Explorer

[dalthviz]

This is causing huge memory leaks right now, so it's really critical for us to fix it.

[CAM-Gerlach]

Is this related or the same as the cause of the memory leaks when modifying objects discussed and confirmed in #5830 , but never fixed?

[ccordoba12]

but never fixed?

I asked @dalthviz to open these issues because the memory leaks are caused by several things, not a single one.

Besides, he's going to work on them in the next couple of weeks.

[CAM-Gerlach]

Okay, great! Glad to hear. So is some combination of these the underlying cause of #5830? Should it be closed as a duplicate, then?

[ccordoba12]

It's not a duplicate. That issue made me realize all these problems, so leave it open for now. We'll see what to do about it later.