Shield object should support builtin types.

[proofit404]

This will be probably an easier way to solve #432

class Container(Injector):

    calculations = shield(list, this.calc1, this.calc2, this.calc3)

    calc1 = Calc1

    calc2 = Calc2

    calc3 = Calc3

Container.calculations  # build list of instantiated dependencies

class Container(Injector):

    calculations = shield(dict, x=this.calc1, y=this.calc2, z=this.calc3)

    calc1 = Calc1

    calc2 = Calc2

    calc3 = Calc3

Container.calculations  # build dict of instantiated dependencies with "x", "y" & "z" keys.