capability to generate non Opt* struct for parameters with default value

[Liooo]

The following schema generates OptInt, but in server side it never comes with Set: false because the default is specified.
Would be nice to have an generator option to make default valued parameters non Opt* in server side.

components:
  parameters:
    page:
      name: page
      in: query
      schema:
        type: integer
        default: 1

[zwpaper]

how about introducing a Default* type, like Opt*, but can return default directly:

func (d DefaultType) Get() Type {}