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both symbol- and numberbox behave inconsitently too: creating a label "$1_slider" (in the properties) will actually create a label "#1_slider" (and save it with the hash)

there is no way to use $args in symbol-/numberboxes (just like there is no way to use hash in iemgui-objects)

imho, it would be good if $args in labels would be expanded in both cases, and hashes would stay hashes.