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Comments on Default Rules: Code Golf I/O

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Default Rules: Code Golf I/O

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What input/output methods do you think should be allowed/disallowed while code golfing on this site? What guidelines for input/output methods do you think should be in place?

One method per answer, please. Vote up/down according to if you believe the given method should be allowed.

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You may modify the input in-place

If a function takes an input a, it is acceptable that a contains the intended output after executing instead of other forms of output. Note that this means a must be mutable to begin with and the function must actually mutate a.

Example

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Same discussion in another Meta post (1 comment)
Clarification (2 comments)
Same discussion in another Meta post
trichoplax‭ wrote about 2 years ago

There seems to be voting on this same point on another Meta discussion Rules for function submissions so I'm linking both ways for future reference.