[BUG]: tracer.wrap overrides the type of the decorated function

[k4nar]

Tracer Version(s)

3.9.0, 3.9.1

Python Version(s)

Python 3.13.3

Pip Version(s)

N/A

Bug Report

Since ddtrace 3.9.0, the decorator @tracer.wrap() overrides the signature of the decorated function. Type checkers think it returns Any.

I believe this is a regression from https://github.com/DataDog/dd-trace-py/pull/13480.

Reproduction Code

from typing import reveal_type

from ddtrace import tracer


@tracer.wrap()
def foo() -> int:
    return 42

reveal_type(foo())

Error Logs

$ uv run --with "ddtrace==3.9.1,mypy" mypy ddtrace-typing.py
ddtrace-typing.py:10: note: Revealed type is "Any"
Success: no issues found in 1 source file

$ uv run --with "ddtrace==3.8.0,mypy" mypy ddtrace-typing.py
ddtrace-typing.py:10: note: Revealed type is "builtins.int"
Success: no issues found in 1 source file

Libraries in Use

No response

Operating System

No response