it almost works:
```
>>> import re; from glasgow.support.lazy import lazy
>>> re.sub(r"a", "b", lazy(lambda: "aaa"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.12/re/__init__.py", line 186, in sub
    return _compile(pattern, flags).sub(repl, string, count)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: expected string or bytes-like object, got 'lazy'
>>> str(lazy(lambda: "aaa"))
'aaa'
```