Use PEP604 syntax (X | Y / X | None)

[timrid]

Use PEP604 union syntax "X | Y" instead of "Union[X, Y]" and "X | None" instead of "Optional[X]" in type hints. We are using Python 3.10+ so we can use the new syntax.

[Copilot]

Pull request overview

This PR modernizes type hints across the project by switching from typing.Union[...] / typing.Optional[...] to PEP 604 union syntax (X | Y, X | None), aligning the codebase with the stated Python 3.10+ requirement.

Changes:

• Replace t.Union[...] / t.Optional[...] annotations with PEP 604 (|) syntax in runtime code, tests, and stub files.
• Enable Ruff pyupgrade rules (UP007, UP045) to enforce the new union style going forward.
• Document the change in CHANGELOG.md.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_typed.py	Updates dataclass field annotations to `X
tests/test_typed_pyright.py	Updates optional bytes annotations to `bytes
tests/declarativeunittest.py	Converts several helper aliases and overload signatures to PEP 604 unions.
pyproject.toml	Enables Ruff UP007/UP045 to enforce PEP 604 union/optional style.
construct-stubs/lib/py3compat.pyi	Updates union types in stubs to PEP 604 syntax.
construct-stubs/lib/containers.pyi	Updates stub union types to PEP 604 syntax.
construct-stubs/lib/bitstream.pyi	Updates optional/union stub types to PEP 604 syntax.
construct-stubs/expr.pyi	Updates union/optional stub types to PEP 604 syntax.
construct-stubs/debug.pyi	Updates optional callable type to PEP 604 syntax.
construct-stubs/core.pyi	Broad conversion of unions/optionals in core stubs to PEP 604 syntax.
construct_typed/tenum.py	Updates optional/union annotations in enum helpers to PEP 604 syntax.
construct_typed/generic_wrapper.py	Updates a type alias to PEP 604 syntax.
construct_typed/dataclass_struct.py	Updates several function parameter annotations to PEP 604 syntax.
CHANGELOG.md	Notes the migration to PEP 604 type hint syntax.

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