My nearest electronics store has the strange policy of selling one anything that is vaguely like the components they do not have. Then they seal them in plastic, before one pays for them at the till. So they have sold me, for example, 10μF capacitors instead of 100μF, 1W Zeners instead of 5W, 072 IC's instead of 071's, or one-core wire instead of two-core. For anyone with a basic knowledge of electronics, such are major differences. Their most recent swap was a classic: they gave me 4016 IC's instead of 40106's. As usual, they sealed them in plastic before payment. I went back and asked them for 40106 IC's. They would have to order them, they said. And so they ordered 4584's.
OBSERVATION: While I haven't ever tried 4584's, they should do what I want. But for someone like me, who is into experimental electronics, slight differences can be critical, such as input impedances or reverse voltages.
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