always cast `name` to a symbol, and never to_s it
always cast `name` to a symbol, and never to_s it

All callers of `action_path` interpolate the return value in to a
string, so there is no need for the method to to_s it.  to_sym on a
symbol will return the same symbol, though I think `action_path` may
always be called with a symbol so this might not be necessary.

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