component which is supposed to have property
speculated property that is to be tested if it is present in component
optional allocator used only for allocation of accessed/tested components. It should not be used for other purposes whatsoever.
true if property is in component
Check if requested property is present in component.
Check if requested property is present in component. The method could have allocation side effects due to the fact that it is not restricted in calling access method of the accessor.