improv: Arrays in Object[]

[bokken]

Support an Object[] which contains other arrays as a multi-dimensional array.

#2226

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[hashhar]

@bokken @davecramer Anything I can help with to eventually make this in?

[bokken]

We will have a release here pretty soon which drops support for jre 6 and 7.
I will merge this in after that.

[wendigo]

@bokken that's a great news! Thanks

[hashhar]

@bokken I see that 42.3.0 was just cut and removed support for JRE 6 and 7. Does this mean this PR is now unblocked?