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I'm a fan of inclusive min, exclusive max for rng. It behaves consistently with decimal numbers in a readable way, for example int(0,100) can return 100 different integers. x<0 has a 0% chance of happening, x<50 is 50%, x<100 is 100%. If you swap with dec(0,100) you could now get 99.999 but x<50 is still exactly 50%
I do agree with amio on consistency and making sure each method added is worth the abstraction.
In that case, I might add an optional boolean toggle for use as a range. But the default should be inclusive to stay consistent with the float method... I think.
Realistically, whichever one is the most commonly used in your project/framework/language/whatever, so it doesn't stick out as an inconsistency. If you're wondering about this now, it's a potential point of confusion for anyone who needs to read the code, including future you.
If you want to be really picky about engineering: are you sure you do need to write the function at all? How does the new function save time/effort or make code easier to read and write? Do you write a lot of code where you need random vectors, and does "random vector" mean the same thing in all cases? Would the function itself just make more code that needs maintaining, possibly indefinitely?
I already named the variables minimum and maximum, so inclusive should make more sense. The code generates a vector within a square/cube defined by 2 other vectors.
Those are all good questions, and yes.
What kind of vectors?
Without further information, right-open is usually the best choice.