Leaves as mulch rake up or till under?

Last fall I mulched the garden with about 6" of leaves (rather than growing a green manure). The leaves have compacted into a mat and I don't know whether to rake it all up or try and till it under. I had thought the leaves would have been more decayed by now. I could also drag disk over the leaves and then till under. Any thoughts or opinions much appriciated.

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