# fixhunt regression fixture: ruff FURB103, ruff 0.17.1
# the fix labelled safe changes the program's output on this program
# before the fix: no stdout, stderr "TypeError: write() argument must be str, not Num", exit 1
# after the fix: no stdout, stderr "TypeError: data must be str, not Num", exit 1
# finding 2026-10-27T22-10-17-844Z-aav5-ruff-FURB103/r2-p007; rule fired 1 time(s) before the fix

class Num:
    def __init__(self, v): self.value = v
n = Num(42)
with open('num.txt', 'w') as f:
    f.write(n)