Here's the deal ... AR was announced as the lead of Mattel's newest toy-to-movie offering, meaning he's going to play Bob himself -- although, in the press release that's going around ... it says his character's real name is actually "Roberto."

The official description of the plot reads ... "When Roberto 'Bob' travels to the enchanting island of Puerto Rico for a major construction job, he takes on issues affecting the island and digs deeper into what it means to build. Bob’s journey will celebrate the vibrant and colorful textures of the Caribbean Latin nations and their people."

The other big news from this is the fact that Jennifer Lopez's movie company -- Nuyorican Productions -- is helping make this thing ... of course, she herself is also Latina.

So the question ... why are we making 'Bob the Builder' Hispanic all of a sudden???

That's certainly what a lot of people online are asking right now -- not to mention a bunch of memes and jokes about this surprise twist on the cartoon show that's been around for years. The biggest takeaway is that Bob has always been perceived as a white character.

Now, however, it looks like J Lo and co. wanna reimagine that for some reason -- and let's just say there are mixed reactions to the decision. Some are for it, arguing it shouldn't matter what race/ethnicity Bob is ... but others are crying foul and claiming this is "woke" casting.

Worse yet ... some are even suggesting that making Bob Latino might just be a little racist -- playing into stereotypes and turning a character on its head, which nobody asked for.

Funny enough, there are even a handful of folks suggesting Jen and everybody would've been better off developing/adapting another "worker" cartoon character who's already written as a Latino ... namely, 'Handy Manny.' Why not just have Anthony play him?

How people are digesting this is for sure a mixed bag -- and we suppose Bob's racial identity is, technically, in the eye of the beholder. We'll say this ... it does sorta feel like a reach.