Is the ending of Inception real or fake?

Could you please elaborate on the nature of the ending in the film "Inception"? Is it intended to be a clear-cut conclusion, or does it leave room for interpretation and debate? Are there any subtle clues or hints within the film that might suggest whether the ending is real or merely a construct of the protagonist's mind? Ultimately, what do you think - is the ending of "Inception" a genuine representation of reality, or is it a carefully crafted illusion meant to deceive the audience?