As a well-known idiom, mypy recommends to use ellipsis ("...") for
default argument values as a elided style. This allows to write the
style and helps to document it with copying the default argument
values from actual implementation.
Note: This does not copy the default argument value when the argument
of overloaded function has its own default value.
The default values for overloaded functions are rendered as string
literal unexpectedly because autodoc extracts code snippets from
the source code, not actual value (ex. int, ellipsis, and so on).
This introduces a simple wrapper class; `DefaultValue` to render these
code snippets like actual values, not string literals.
So far, type annotations for overloaded functions are not resolved
because they are obtained from AST directly. This tries to evaluate
them using a context of its function or method.
