I can't figure out how many grammatical cases Telugu has:
- Wikipedia says 8 (Telugu grammar)
- Telugu itself says 8, but I'm not sure if they map 1-1 to linguistic cases (విభక్తులు/viḅaktulu)
- I found a blog post that maps them to the ones in the Wikipedia article, but I'm not sure if it's accurate (Telugu Nouns: Grammatical Case)
- Another source says 7 (lists a few different cases than the Wikipedia article), but I'm not sure if I'd count it as 8, since it does merge two using a hyphen, but those two cases do exist separately (Telugu)
- Another one (probably not very reliable) says 25, which seems a bit high to me, considering what the more reputable sources say (Telugu language)
Since all the others mostly match up in terms of count (7/8), concerning the 25, looking through it, it doesn't seem inaccurate. Telugu does have noun endings and inflection for all of those listed. It may have more endings than listed there, but I'm not sure, since I speak English better than I do Telugu.
So how do you count cases, and specifically, why not many of the ones in the last source? To me, 25 cases seem like too many, especially given the answers of more reliable sources, but I have no idea why it shouldn't be 25.
This is especially since Wikipedia does count these cases for other languages, e.g. Finnish (which has 10 cases in common with Telugu if we take the 25 to be valid), where the -ssa suffix is used for the inessive case (-లో/-lō in Telugu). Is there anything different that makes Finnish's inessive case (and other cases common between the two according to the last source) valid and not Telugu's?