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fcntl: make mutate_flag optional for ioctl w/ read-only buffer - #3882
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Having the flag mandatory broke code like buf = fcntl.ioctl(fileno, termios.TIOCGWINSZ, 8 * b' ') which had to be rewritten as buf = fcntl.ioctl(fileno, termios.TIOCGWINSZ, 8 * b' ', False) which happens to be incompatible with Python 2, and extra noise. Fixes python#3881
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Having the flag mandatory broke code like
which had to be rewritten as
which happens to be incompatible with Python 2, and extra noise.
Fixes #3881