How does variable scope work across nested BeanShell method closures?

An inner scripted method closure can generally see and reference variables from the namespace it was defined within, similar to how a nested function in many scripting languages can access variables from its enclosing function.

Because BeanShell closures capture a reference to their enclosing namespace rather than a fixed snapshot, changes made to a shared variable in the outer scope after the closure was defined can still be visible to the closure when it's actually invoked later, since it's referencing the live namespace, not a frozen copy of it at definition time.

This live-reference behavior is powerful for building small stateful scripted objects, but it's also a common source of subtle bugs if a script author assumes a closure captured a fixed value at definition time when it actually continues to reference a variable that keeps changing afterward.

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