Hidden Flag: [scientific Computation] N. An Extra Option Added To A Routine Without Changing The Calling Sequence.

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:hidden flag: [scientific computation] n. An extra option added to
a routine without changing the calling sequence. For example,
instead of adding an explicit input variable to instruct a routine
to give extra diagnostic output, the programmer might just add a
test for some otherwise meaningless feature of the existing inputs,
such as a negative mass. The use of hidden flags can make a
program very hard to debug and understand, but is all too common
wherever programs are hacked on in a hurry.
-- The AI Hackers Dictionary