Huh? I expect ['foo', 'bar', 'baz', 'quux']. I expect accumulation, esp with a list. If I wanted ['foo', 'bar', 'quux'] I would send in a fresh copy of a list

Huh? I expect ['foo', 'bar', 'baz', 'quux']. I expect accumulation, esp with a list. If I wanted ['foo', 'bar', 'quux'] I would send in a fresh copy of a list instead of a list I'd been whoring around to other functions. function('baz', list(MODULE_LEVEL_CONSTANT)) function('quux', list(MODULE_LEVEL_NOT_CONSTANT)) I would also change MODULE_LEVEL_CONSTANT to not say CONSTANT cause a list is no such thing and doesn't become constant just cause a label says so. Maybe it even leads people to expect silly things.