Override env['api.format'] to return arbitrary types.
Override env['api.format'] to return arbitrary types.

dan-corneanu/grape-on-rack,ruby-grape/grape-on-rack,dansteele/redbox,dblock/grape-on-rack,dansteele/redbox,ruby-grape/grape-on-rack,ruby-grape/grape-on-rack,dan-corneanu/grape-on-rack,dan-corneanu/grape-on-rack,dblock/grape-on-rack,dblock/grape-on-rack,dansteele/redbox