monkey patch fix for VCR normalisation code: see github.com/myronmarston/vcr/issues/4 when body is a tempfile, like when creating new blob this method of normalisation fails and excon throws errors (Excon::Errors::SocketError:can't convert Tempfile into String)
RELEVANT: github.com/myronmarston/vcr/issues/101 (will need revisiting when vcr 2 comes along)
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