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Comment by tyingq | Hacker News Reader

Perl can do both ways:

  $ perl -E 'say(4 % -3)'
  -2

  $ perl -E 'use integer;say(4 % -3)'
  1

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Interpreter state ("what's been `use`d") completely changing the meaning of that expression sounds like the worst possible way to do it.

It is lexically scoped, so you can wall it off with a {} block. And there's 'no integer;' to turn it off as well.

It's a pattern in Perl, like "use strict;" for example, which is also lexically scoped and has a "no strict;" counterpart.

Maybe it amounts to the same thing, but the example you give is not what the original post is about, which is -4 % 3 . It is true that "use integer" affects both calculations.

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