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4.2.62 ‘-u’: Undefine Fweb macro (Ftangle)

-uA’ undefines the Fweb macro ‘A’ previously defined on the command line (or in .fweb) via ‘-m’.

CAUTION: This option can also undefine built-in functions such as $IF. Don't do that, since built-ins can use other built-ins behind the scenes; undefining one can cause very strange behavior.