@param < T> the type of environmental service
@param type class used to select a service
@return the current service
@throws RuntimeException if no service of that type has been added
Peeks at the current top of the indicated stack (which must have a non-null value).
@param < T> the type of environmental object
@param type class used to select the object
@return the current object of the specified type
@throws RuntimeException if no service of that type has been added
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