Add more specific integer constructors

Fixes numpy#72

- Removed SupportsFloat from the classes int8, int16, int32, int64, uint8, uint16, uint32, and uint64
- Removed a test from tests/pass/scalars.py
- Added several tests to tests/fail/scalars.py

Author: rajatdiptabiswas

numpy-stubs/__init__.pyi

@@ -417,10 +417,18 @@ class datetime64:
 
 class integer(number, _real_generic): ...
 class signedinteger(integer): ...
-class int8(signedinteger): ...
-class int16(signedinteger): ...
-class int32(signedinteger): ...
-class int64(signedinteger): ...
+
+class int8(signedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
+class int16(signedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
+class int32(signedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
+class int64(signedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
 
 class timedelta64(signedinteger):
     def __init__(self, _data: Any = ..., _format: str = ...) -> None: ...
@@ -441,10 +449,19 @@ class timedelta64(signedinteger):
     def __mod__(self, other: timedelta64) -> timedelta64: ...
 
 class unsignedinteger(integer): ...
-class uint8(unsignedinteger): ...
-class uint16(unsignedinteger): ...
-class uint32(unsignedinteger): ...
-class uint64(unsignedinteger): ...
+
+class uint8(unsignedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
+class uint16(unsignedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
+class uint32(unsignedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
+class uint64(unsignedinteger):
+    def __init__(self, value: SupportsInt = ...) -> None: ...
+
 class inexact(number): ...
 class floating(inexact, _real_generic): ...
 class float16(floating): ...

tests/fail/scalars.py

@@ -37,3 +37,16 @@
 td_64 / dt_64  # E: No overload
 td_64 % 1  # E: Unsupported operand types
 td_64 % dt_64  # E: Unsupported operand types
+
+class A:
+    def __float__(self):
+        return 1.0
+
+np.int8(A())  # E: incompatible type
+np.int16(A())  # E: incompatible type
+np.int32(A())  # E: incompatible type
+np.int64(A())  # E: incompatible type
+np.uint8(A())  # E: incompatible type
+np.uint16(A())  # E: incompatible type
+np.uint32(A())  # E: incompatible type
+np.uint64(A())  # E: incompatible type

tests/pass/scalars.py

@@ -20,7 +20,6 @@ def __float__(self):
 np.int16(3.4)
 np.int32(4)
 np.int64(-1)
-np.uint8(A())
 np.uint32()
 
 np.float16(A())