"Drop ban on mutable references"

The landmark event happened: Google drops ban on mutable references for function parameters.

https://google.github.io/styleguide/cppguide.html#Inputs_and_Outputs

Parameters are either input to the function, output from the function, or both. Input parameters should usually be values or const references, while required (non-nullable) output and input/output parameters should usually be references.

https://github.com/google/styleguide/pull/553

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