Hello!
I want to discuss one feature for handful working with shapes of array-like
objects.
If we want to pass arrays to function we can declare their sizes directly with
argument declaration:
```
def foo(a[m, n], b[n]):
for i in range(m):
for j in range(n):
a[i, j] = b[j]
```
Will be equivalent to
```
def foo(a, b):
m, n = a.__shape__()
n_b = b.__shape__()
if n_b != n:
raise ShapeNotValidException()
...
```
Objects should implement `__shape__` magic method to use this syntax.
Shapes automatically introduced to variables and checked.
Also we can allow more complex checks, e.g.:
```
def bar(a[2,...]):
...
```
will check that first dimension of passed array equals to 2.
Or:
```
def bar(a[n], b[2*n]):
# checks that a.__shape__()[0] == 2 * b.__shape__()[0]
...
```
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