Signature.return_annotation somehow turns into string when the function is ran under a marimo cell

[Retorikal]

Describe the bug

Running code snippet

from inspect import signature

def wololo(i: int, ii: int) -> tuple[str, int]:
    a = i+ii
    b = ii-i
    c = f"{a} {b}"
    return c, b

print(signature(wololo).return_annotation, type(signature(wololo).return_annotation))

on python console it prints tuple[str, int] <class 'types.GenericAlias'> according to expectation, but on a marimo cell it prints tuple[str, int] <class 'str'>, so somehow the return annotation type is a string instead of an actual type object.

Also occurs on functions with primitive return type annotations like def wololo(i: int, ii: int) -> int

Could be a inspect.signature bug too but I haven't seen any clue pointing that way yet

Environment

{
  "marimo": "0.9.34",
  "OS": "Linux",
  "OS Version": "6.8.12-4-pve",
  "Processor": "",
  "Python Version": "3.11.2",
  "Binaries": {
    "Browser": "--",
    "Node": "--"
  },
  "Dependencies": {
    "click": "8.1.7",
    "docutils": "0.21.2",
    "itsdangerous": "2.2.0",
    "jedi": "0.19.2",
    "markdown": "3.7",
    "narwhals": "1.17.0",
    "packaging": "24.2",
    "psutil": "6.1.0",
    "pygments": "2.18.0",
    "pymdown-extensions": "10.12",
    "pyyaml": "6.0.2",
    "ruff": "0.8.2",
    "starlette": "0.41.3",
    "tomlkit": "0.13.2",
    "typing-extensions": "4.12.2",
    "uvicorn": "0.32.1",
    "websockets": "14.1"
  },
  "Optional Dependencies": {
    "pandas": "2.2.3"
  }
}

Code to reproduce

No response

[akshayka]

It looks like a from __future__ import annotations import affects the cell runner. Is this a big issue for you, or just a curiosity?

[Retorikal]

For my own uses i can make a workaround.

Thank you for the clarification.