requestFragment
open fun <T, TContext> IMonoStep<T>.requestFragment(eager: Boolean = true, body: IRecursiveFragmentBuilder<T, TContext>.() -> Unit): IRequestedFragment<TContext>
open fun <T, TContext> IFluxStep<T>.requestFragment(eager: Boolean = true, body: IRecursiveFragmentBuilder<T, TContext>.() -> Unit): IRequestedFragment<TContext>
open fun <TIn, TContext> IMonoStep<TIn>.requestFragment(fragment: IUnboundFragment<TIn, TContext>): IRequestedFragment<TContext>
open fun <TIn, TContext> IFluxStep<TIn>.requestFragment(fragment: IUnboundFragment<TIn, TContext>): IRequestedFragment<TContext>