cmath.exp(1j) generates diagnostics for general type issue.

[gyu-don]

Note: if you are reporting a wrong signature of a function or a class in the standard library, then the typeshed tracker is better suited for this report: https://github.com/python/typeshed/issues.

Describe the bug

cmath.exp(1j) generates general type issues

Argument of type "complex" cannot be assigned to parameter "__z" of type "_C" in function "exp"
  Type "complex" cannot be assigned to type "_C"
    "__float__" is not present
    "__complex__" is not present

To Reproduce
Write following codes on VS Code.

import cmath
cmath.exp(1j)

Expected behavior
Don't generates this diagnostics because it's valid code.

VS Code extension or command-line
VS Code extension, Ver. 1.1.124

[gyu-don]

Oops, it seems typeshed's issues. _C is defined as

_C = Union[SupportsFloat, SupportsComplex]

in https://github.com/python/typeshed/blob/master/stdlib/cmath.pyi
but

hasattr(1j, '__complex__') # => False