Were you trying to hit two birds with one stone? I have to share an answer with Pilgramshope?! I see. I'm not worth the extra effort? Wow! I must be a really soft

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Ok, I can work with it. God presented Jonah with the decision, and with no foreknowledge of the fish, he had a choice between everyone in the boat's certain death or letting them throw him over to what, as far as any of them could see, was his certain death, and everyone in the boat knew that Jonah ('s disobedience), personally, was the reason of the storm. So, like Isaac, Jonah agreed to the (required) sacrifice. Then along comes the fish that spits him back onto dry ground and, presented again with the choice to go to Nineveh, surely Jonah had at least a better understanding of the result of fighting against God and so he goes, but still begrudgingly given he's still sulking under the sprout afterward.
Jonah's mission was in regard to declaring the message of God's intentions upon the city
and his extension of mercy toward it contingent upon their repentance. Could they have refused? They saw their sworn enemy, that hated them with everything he had, come out of the depths of the sea with seaweed still clinging to the crack of his loincloth telling them that it pleased God to extend mercy toward them if they'd repent in sackcloth and ashes. Could they have said, "Ha! as if? @that?! Yes, if they were totally and absolutely incapable of reasoning that God is faithful to do as He says, even after being given such evidence of the lengths He will go in the effort to carry out His will?
Do not feel obligated to answer these question that follow as they are likely only rhetorical in nature as I wonder out loud.
Although it was God's intention, and I'll put it, rather than say 'to save Nineveh', I'll phrase it as 'not to destroy Ninevah' since history informs us that Ninevah is eventually destroyed. Was it God's intended 'purpose' in dealing with Nineveh at all to reveal His overarching plan to be realized in Christ?