Remove circular dependencies when logging. Fixes #737

[rhodgkins]

Pretty sure this has been missed and was supposed to be merged in at some point! Fixes #737

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[rhodgkins]

Could anyone give this a review and merge please?

[garyo]

I'm seeing missing logs in my app, presumably due to #737, and saw this. I have one comment, just looking at the patch: will this modify the original object passed to the log function? Seems like it might, which would be bad.