Fix NDArray.size to return the number of elements, not size in bytes

Author: FrancescAlted

RELEASE_NOTES.md

@@ -2,7 +2,10 @@
 
 ## Changes from 3.11.0 to 3.11.1
 
-XXX version-specific blurb XXX
+* Change the `NDArray.size` to return the number of elements in array,
+  instead of the size of the array in bytes. This follows the array
+  API, so it is considered a fix, and takes precedence over a possible
+  backward incompatibility.
 
 ## Changes from 3.10.2 to 3.11.0
 

src/blosc2/blosc2_ext.pyx

@@ -2387,7 +2387,7 @@ cdef class NDArray:
 
     @property
     def size(self):
-        return self.array.nitems * self.array.sc.typesize
+        return self.array.nitems
 
     @property
     def chunksize(self):
@@ -2556,7 +2556,7 @@ cdef class NDArray:
         return self
 
     def tobytes(self):
-        buffersize = self.size
+        buffersize = self.size * self.array.sc.typesize
         buffer = bytes(buffersize)
         _check_rc(b2nd_to_cbuffer(self.array, <void *> <char *> buffer, buffersize),
                   "Error while filling the buffer")