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3.4.50 set-writable - Make the output file be writable

Usage: (set-writable [ set? ])
This function will set the current output file to be writable (or not). This is only effective if neither the --writable nor --not-writable have been specified. This state is reset when the current suffix’s output is complete.

Arguments:
set? - Optional - boolean arg, false to make output non-writable