A MethodCall is a resendable message-send, complete with receiver, instantiated arguments, and a memory of when it was last evaluated and what the last value was.

The methodInterface with which it is associated can furnish argument names, documentation, and other information.

	evaluation
	evaluate everEvaluated lastValue

	initialization
	receiver:methodInterface: receiver:methodInterface:initialArguments: valueOfArgumentNamed:

	method interface
	ephemeralMethodInterface methodInterface methodInterface: methodInterfaceOrNil

	argument access	top
	setArgumentNamed:toValue: Set the argument of the given name to the given value

	evaluation	top
	evaluate Evaluate the receiver, and if value has changed, signal value-changed
	everEvaluated Answer whether this method call has ever been evaluated
	lastValue Answer the last value I remember obtaining from an evaluation

	initialization	top
	receiver:methodInterface: Initialize me to have the given receiver and methodInterface
	receiver:methodInterface:initialArguments: Set up a method-call for the given receiver, method-interface, and initial arguments
	valueOfArgumentNamed: Answer the value of the given arguement variable

	method interface	top
	ephemeralMethodInterface Answer a methodInterface for me. If I have one stored, answer it; if not, conjure up an interface and answer it but do NOT store it internally. You can call this directly if you need a method interface for me but do not want any conjured-up interface to persist.
	methodInterface Answer the receiver's methodInterface, conjuring one up on the spot (and remembering) if not present
	methodInterface: Set my methodInterface
	methodInterfaceOrNil Answer my methodInterface, whether it is nil or not