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I've noticed that zero seems to be negative for treaties. From memory you can see the same thing if you give gold to bring the value from negative up to zero. At zero the AI says No, whereas for other, non-treaty trades zero is ok.

I assume for treaties the test is for > 0, for other trades the test is >= 0. Probably not intended, not exactly a massive bug but probably quite easy to fix.

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I assume the faction you're trading with likes Technology treaties. In some circumstances I believe they will pay you to have a technology treaty.

Did they propose it to your faction, or did your faction propose it to them?

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I'ts decimal issue.

That number is probably something like -0.3 or anything less than -0.5, the game rounds the number and shows as just -0, but it is still -0.3 and -0.3 is not equal to 0.