Fix ImportError from private typing module members in Python 3.8

[Copilot]

The code imports _UnionGenericAlias and _GenericAlias from the typing module, which are private APIs not guaranteed to exist across Python versions. In Python 3.8, these members don't exist, causing ImportError: cannot import name '_UnionGenericAlias' from 'typing'.

Changes

• Replace private imports _UnionGenericAlias and _GenericAlias with public API get_origin
• Consolidate type checking logic: type(x) == _UnionGenericAlias or type(x) == _GenericAlias → get_origin(x) is not None

Before:

from typing import _UnionGenericAlias, List, _GenericAlias

if type(data["type"]["python"]) == _UnionGenericAlias:
    data["type_name"]["python"] = data["type"]["python"].__repr__()
elif type(data["type"]["python"]) == _GenericAlias:
    data["type_name"]["python"] = data["type"]["python"].__repr__()

After:

from typing import List, get_origin

if get_origin(data["type"]["python"]) is not None:
    # Handle generic types (Union, List, etc.)
    data["type_name"]["python"] = data["type"]["python"].__repr__()

This maintains compatibility with Python 3.8+ using only public typing APIs.

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[Copilot]

Pull request overview

This PR fixes a Python 3.8 compatibility issue by replacing private typing module members with public APIs. The code previously imported _UnionGenericAlias and _GenericAlias from the typing module, which are internal implementation details that don't exist in Python 3.8, causing ImportError.

Changes:

• Replace private typing imports (_UnionGenericAlias, _GenericAlias) with public get_origin API
• Consolidate type checking logic from two separate conditions into a single check using get_origin(x) is not None
• Add explanatory comment for the generic type handling

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